PAT 1007(简单粗暴)

1007 素数对猜想 （20 分）

让我们定义d​n​​为：d​n​​=p​n+1​​−p​n​​，其中p​i​​是第i个素数。显然有d​1​​=1，且对于n>1有d​n​​是偶数。“素数对猜想”认为“存在无穷多对相邻且差为2的素数”。

现给定任意正整数N(<10​5​​)，请计算不超过N的满足猜想的素数对的个数。

输入格式:

输入在一行给出正整数N。

输出格式:

在一行中输出不超过N的满足猜想的素数对的个数。

输入样例:

20

输出样例:

4

 解题思路

穷举:N最大到10^5, 最多有9592个素数，最多有9591个素数对

#include <stdio.h>
int main()
{
    int a[9592] = 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37,92243,92251,92269,92297,92311,92317,92333,92347,92353,92357,92363,92369,92377,92381,92383,92387,92399,92401,92413,92419,92431,92459,92461,92467,92479,924,92503,92507,92551,92557,92567,92569,92581,92593,92623,92627,92639,921,927,92657,92669,92671,92681,92683,92693,92699,92707,92717,92723,92737,92753,92761,92767,92779,927,92791,92801,92809,92821,92831,92849,92857,92861,92863,92867,923,929,92921,92927,92941,92951,92957,92959,92987,92993,93001,93047,93053,93059,93077,93083,930,93097,93103,93113,93131,93133,93139,93151,93169,93179,93187,93199,93229,93239,93241,93251,93253,93257,93263,93281,93283,93287,93307,93319,93323,93329,93337,93371,93377,93383,93407,93419,93427,93463,93479,93481,93487,93491,93493,93497,93503,93523,93529,93553,93557,93559,93563,93581,93601,93607,93629,93637,93683,93701,93703,93719,93739,93761,93763,93787,93809,93811,93827,93851,93871,93887,938,933,93901,93911,93913,93923,93937,93941,93949,93967,93971,93979,93983,93997,94007,94009,94033,94049,94057,94063,94079,94099,94109,94111,94117,94121,94151,94153,94169,94201,94207,94219,94229,94253,94261,94273,94291,94307,94309,94321,94327,94331,94343,94349,94351,94379,94397,94399,94421,94427,94433,94439,94441,94447,94463,94477,94483,94513,94529,94531,941,943,947,94559,94561,94573,94583,94597,94603,94613,94621,949,94651,94687,94693,94709,94723,94727,94747,94771,94777,94781,947,94793,94811,94819,94823,94837,94841,94847,94849,94873,948,94903,94907,94933,94949,94951,94961,94993,94999,95003,95009,95021,95027,95063,95071,95083,95087,950,95093,95101,95107,95111,95131,95143,95153,95177,951,95191,95203,95213,95219,95231,95233,95239,95257,95261,95267,95273,95279,95287,95311,95317,95327,95339,95369,95383,95393,901,913,919,929,941,943,961,967,971,979,983,95507,95527,95531,95539,959,95561,95569,95581,95597,95603,95617,95621,95629,95633,95651,95701,95707,95713,95717,95723,95731,95737,95747,95773,95783,957,95791,95801,95803,95813,95819,95857,95869,95873,95881,951,95911,95917,95923,95929,95947,95957,95959,95971,95987,959,96001,96013,96017,96043,96053,96059,96079,96097,96137,96149,96157,96167,96179,96181,96199,96211,96221,96223,96233,96259,96263,96269,96281,962,96293,96323,96329,96331,96337,96353,96377,901,919,931,943,951,957,961,969,979,987,993,997,96517,96527,96553,96557,96581,96587,965,96601,963,96661,96667,96671,96697,96703,96731,96737,96739,96749,96757,96763,96769,96779,96787,96797,96799,96821,96823,96827,96847,96851,96857,963,96907,96911,96931,96953,96959,96973,96979,969,96997,97001,97003,97007,97021,97039,97073,97081,97103,97117,97127,97151,97157,97159,97169,97171,97177,97187,97213,97231,97241,97259,97283,97301,97303,97327,97367,97369,97373,97379,97381,97387,97397,97423,97429,97441,97453,97459,97463,97499,97501,97511,97523,977,979,97553,97561,97571,97577,97579,97583,97607,97609,97613,979,97651,97673,97687,97711,97729,97771,97777,97787,977,97813,97829,97841,97843,97847,97849,97859,97861,97871,97879,97883,97919,97927,97931,97943,97961,97967,97973,97987,98009,98011,98017,98041,98047,98057,98081,98101,98123,98129,98143,98179,98207,98213,98221,98227,98251,98257,98269,98297,98299,98317,98321,98323,98327,98347,98369,98377,98387,983,98407,98411,98419,98429,98443,98453,98459,98467,98473,98479,98491,98507,98519,98533,983,98561,98563,98573,98597,98621,98627,98639,981,98663,98669,986,98711,98713,98717,98729,98731,98737,98773,98779,98801,98807,98809,98837,98849,98867,98869,98873,98887,983,987,9,909,911,927,929,939,947,953,963,981,993,999,99013,99017,99023,99041,99053,99079,99083,990,99103,99109,99119,99131,99133,99137,99139,99149,99173,99181,99191,99223,99233,99241,99251,99257,99259,99277,992,99317,99347,99349,99367,99371,99377,99391,99397,99401,99409,99431,99439,99469,99487,99497,99523,99527,99529,99551,99559,99563,99571,99577,99581,99607,99611,99623,993,99661,99667,99679,996,99707,99709,99713,99719,99721,99733,99761,99767,99787,99793,99809,99817,99823,99829,99833,99839,99859,99871,99877,99881,99901,99907,99923,99929,99961,99971,999,99991};
    int b[9591] = {1,2,2,4,2,4,2,4,6,2,6,4,2,4,6,6,2,6,4,2,6,4,6,8,4,2,4,2,4,14,4,6,2,10,2,6,6,4,6,6,2,10,2,4,2,12,12,4,2,4,6,2,10,6,6,6,2,6,4,2,10,14,4,2,4,14,6,10,2,4,6,8,6,6,4,6,8,4,8,10,2,10,2,6,4,6,8,4,2,4,12,8,4,8,4,6,12,2,18,6,10,6,6,2,6,10,6,6,2,6,6,4,2,12,10,2,4,6,6,2,12,4,6,8,10,8,10,8,6,6,4,8,6,4,8,4,14,10,12,2,10,2,4,2,10,14,4,2,4,14,4,2,4,20,4,8,10,8,4,6,6,14,4,6,6,8,6,12,4,6,2,10,2,6,10,2,10,2,6,18,4,2,4,6,6,8,6,6,22,2,10,8,10,6,6,8,12,4,6,6,2,6,12,10,18,2,4,6,2,6,4,2,4,12,2,6,34,6,6,8,18,10,14,4,2,4,6,8,4,2,6,12,10,2,4,2,4,6,12,12,8,12,6,4,6,8,4,8,4,14,4,6,2,4,6,2,6,10,20,6,4,2,24,4,2,10,12,2,10,8,6,6,6,18,6,4,2,12,10,12,8,16,14,6,4,2,4,2,10,12,6,6,18,2,16,2,22,6,8,6,4,2,4,8,6,10,2,10,14,10,6,12,2,4,2,10,12,2,16,2,6,4,2,10,8,18,24,4,6,8,16,2,4,8,16,2,4,8,6,6,4,12,2,22,6,2,6,4,6,14,6,4,2,6,4,6,12,6,6,14,4,6,12,8,6,4,26,18,10,8,4,6,2,6,22,12,2,16,8,4,12,14,10,2,4,8,6,6,4,2,4,6,8,4,2,6,10,2,10,8,4,14,10,12,2,6,4,2,16,14,4,6,8,6,4,18,8,10,6,6,8,10,12,14,4,6,6,2,28,2,10,8,4,14,4,8,12,6,12,4,6,20,10,2,16,26,4,2,12,6,4,12,6,8,4,8,22,2,4,2,12,28,2,6,6,6,4,6,2,12,4,12,2,10,2,16,2,16,6,20,16,8,4,2,4,2,22,8,12,6,10,2,4,6,2,6,10,2,12,10,2,10,14,6,4,6,8,6,6,16,12,2,4,14,6,4,8,10,8,6,6,22,6,2,10,14,4,6,18,2,10,14,4,2,10,14,4,8,18,4,6,2,4,6,2,12,4,20,22,12,2,4,6,6,2,6,22,2,6,16,6,12,2,6,12,16,2,4,6,14,4,2,18,24,10,6,2,10,2,10,2,10,6,2,10,2,10,6,8,30,10,2,10,8,6,10,18,6,12,12,2,18,6,4,6,6,18,2,10,14,6,4,2,4,24,2,12,6,16,8,6,6,18,16,2,4,6,2,6,6,10,6,12,12,18,2,6,4,18,8,24,4,2,4,6,2,12,4,14,30,10,6,12,14,6,10,12,2,4,6,8,6,10,2,4,14,6,6,4,6,2,10,2,16,12,8,18,4,6,12,2,6,6,6,28,6,14,4,8,10,8,12,18,4,2,4,24,12,6,2,16,6,6,14,10,14,4,30,6,6,6,8,6,4,2,12,6,4,2,6,22,6,2,4,18,2,4,12,2,6,4,26,6,6,4,8,10,32,16,2,6,4,2,4,2,10,14,6,4,8,10,6,20,4,2,6,30,4,8,10,6,6,8,6,12,4,6,2,6,4,6,2,10,2,16,6,20,4,12,14,28,6,20,4,18,8,6,4,6,14,6,6,10,2,10,12,8,10,2,10,8,12,10,24,2,4,8,6,4,8,18,10,6,6,2,6,10,12,2,10,6,6,6,8,6,10,6,2,6,6,6,10,8,24,6,22,2,18,4,8,10,30,8,18,4,2,10,6,2,6,4,18,8,12,18,16,6,2,12,6,10,2,10,2,6,10,14,4,24,2,16,2,10,2,10,20,4,2,4,8,16,6,6,2,12,16,8,4,6,30,2,10,2,6,4,6,6,8,6,4,12,6,8,12,4,14,12,10,24,6,12,6,2,22,8,18,10,6,14,4,2,6,10,8,6,4,6,30,14,10,2,12,10,2,16,2,18,24,18,6,16,18,6,2,18,4,6,2,10,8,10,6,6,8,4,6,2,10,2,12,4,6,6,2,12,4,14,18,4,6,20,4,8,6,4,8,4,14,6,4,14,12,4,2,30,4,24,6,6,12,12,14,6,4,2,4,18,6,12,8,6,4,12,2,12,30,16,2,6,22,14,6,10,12,6,2,4,8,10,6,6,24,14,6,4,8,12,18,10,2,10,2,4,6,20,6,4,14,4,2,4,14,6,12,24,10,6,8,10,2,30,4,6,2,12,4,14,6,34,12,8,6,10,2,4,20,10,8,16,2,10,14,4,2,12,6,16,6,8,4,8,4,6,8,6,6,12,6,4,6,6,8,18,4,20,4,12,2,10,6,2,10,12,2,4,20,6,30,6,4,8,10,12,6,2,28,2,6,4,2,16,12,2,6,10,8,24,12,6,18,6,4,14,6,4,12,8,6,12,4,6,12,6,12,2,16,20,4,2,10,18,8,4,14,4,2,6,22,6,14,6,6,10,6,2,10,2,4,2,22,2,4,6,6,12,6,14,10,12,6,8,4,36,14,12,6,4,6,2,12,6,12,16,2,10,8,22,2,12,6,4,6,18,2,12,6,4,12,8,6,12,4,6,12,6,2,12,12,4,14,6,16,6,2,10,8,18,6,34,2,28,2,22,6,2,10,12,2,6,4,8,22,6,2,10,8,4,6,8,4,12,18,12,20,4,6,6,8,4,2,16,12,2,10,8,10,2,4,6,14,12,22,8,28,2,4,20,4,2,4,14,10,12,2,12,16,2,28,8,22,8,4,6,6,14,4,8,12,6,6,4,20,4,18,2,12,6,4,6,14,18,10,8,10,32,6,10,6,6,2,6,16,6,2,12,6,28,2,10,8,16,6,8,6,10,24,20,10,2,10,2,12,4,6,20,4,2,12,18,10,2,10,2,4,20,16,26,4,8,6,4,12,6,8,12,12,6,4,8,22,2,16,14,10,6,12,12,14,6,4,20,4,12,6,2,6,6,16,8,22,2,28,8,6,4,20,4,12,24,20,4,8,10,2,16,2,12,12,34,2,4,6,12,6,6,8,6,4,2,6,24,4,20,10,6,6,14,4,6,6,2,12,6,10,2,10,6,20,4,26,4,2,6,22,2,24,4,6,2,4,6,24,6,8,4,2,34,6,8,16,12,2,10,2,10,6,8,4,8,12,22,6,14,4,26,4,2,12,10,8,4,8,12,4,14,6,16,6,8,4,6,6,8,6,10,12,2,6,6,16,8,6,6,12,10,2,6,18,4,6,6,6,12,18,8,6,10,8,18,4,14,6,18,10,8,10,12,2,6,12,12,36,4,6,8,4,6,2,4,18,12,6,8,6,6,4,18,2,4,2,24,4,6,6,14,30,6,4,6,12,6,20,4,8,4,8,6,6,4,30,2,10,12,8,10,8,24,6,12,4,14,4,6,2,28,14,16,2,12,6,4,20,10,6,6,6,8,10,12,14,10,14,16,14,10,14,6,16,6,8,6,16,20,10,2,6,4,2,4,12,2,10,2,6,22,6,2,4,18,8,10,8,22,2,10,18,14,4,2,4,18,2,4,6,8,10,2,30,4,30,2,10,2,18,4,18,6,14,10,2,4,20,36,6,4,6,14,4,20,10,14,22,6,2,30,12,10,18,2,4,14,6,22,18,2,12,6,4,8,4,8,6,10,2,12,18,10,14,16,14,4,6,6,2,6,4,2,28,2,28,6,2,4,6,14,4,12,14,16,14,4,6,8,6,4,6,6,6,8,4,8,4,14,16,8,6,4,12,8,16,2,10,8,4,6,26,6,10,8,4,6,12,14,30,4,14,22,8,12,4,6,8,10,6,14,10,6,2,10,12,12,14,6,6,18,10,6,8,18,4,6,2,6,10,2,10,8,6,6,10,2,18,10,2,12,4,6,8,10,12,14,12,4,8,10,6,6,20,4,14,16,14,10,8,10,12,2,18,6,12,10,12,2,4,2,12,6,4,8,4,44,4,2,4,2,10,12,6,6,14,4,6,6,6,8,6,36,18,4,6,2,12,6,6,6,4,14,22,12,2,18,10,6,26,24,4,2,4,2,4,14,4,6,6,8,16,12,2,42,4,2,4,24,6,6,2,18,4,14,6,28,18,14,6,10,12,2,6,12,30,6,4,6,6,14,4,2,24,4,6,6,26,10,18,6,8,6,6,30,4,12,12,2,16,2,6,4,12,18,2,6,4,26,12,6,12,4,24,24,12,6,2,12,28,8,4,6,12,2,18,6,4,6,6,20,16,2,6,6,18,10,6,2,4,8,6,6,24,16,6,8,10,6,14,22,8,16,6,2,12,4,2,22,8,18,34,2,6,18,4,6,6,8,10,8,18,6,4,2,4,8,16,2,12,12,6,18,4,6,6,6,2,6,12,10,20,12,18,4,6,2,16,2,10,14,4,30,2,10,12,2,24,6,16,8,10,2,12,22,6,2,16,20,10,2,12,12,18,10,12,6,2,10,2,6,10,18,2,12,6,4,6,2,24,28,2,4,2,10,2,16,12,8,22,2,6,4,2,10,6,20,12,10,8,12,6,6,6,4,18,2,4,12,18,2,12,6,4,2,16,12,12,14,4,8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,12,8,6,34,8,22,8,12,10,2,16,42,12,8,22,8,22,8,6,34,2,6,4,14,6,16,2,22,6,8,24,22,6,2,12,4,6,14,4,8,24,4,6,6,2,22,20,6,4,14,4,6,6,8,6,10,6,8,6,16,14,6,6,22,6,24,32,6,18,6,18,10,8,30,18,6,16,12,6,12,2,6,4,12,8,6,22,8,6,4,14,10,18,20,10,2,6,4,2,28,18,2,10,6,6,6,14,40,24,2,4,8,12,4,20,4,32,18,16,6,36,8,6,4,6,14,4,6,26,6,10,14,18,10,6,6,14,10,6,6,14,6,24,4,14,22,8,12,10,8,12,18,10,18,8,24,10,8,4,24,6,18,6,2,10,30,2,10,2,4,2,40,2,28,8,6,6,18,6,10,14,4,18,30,18,2,12,30,6,30,4,18,12,2,4,14,6,10,6,8,6,10,12,2,6,12,10,2,18,4,20,4,6,14,6,6,22,6,6,8,18,18,10,2,10,2,6,4,6,12,18,2,10,8,4,18,2,6,6,6,10,8,10,6,18,12,8,12,6,4,6,14,16,2,12,4,6,38,6,6,16,20,28,20,10,6,6,14,4,26,4,14,10,18,14,28,2,4,14,16,2,28,6,8,6,34,8,4,18,2,16,8,6,40,8,18,4,30,6,12,2,30,6,10,14,40,14,10,2,12,10,8,4,8,6,6,28,2,4,12,14,16,8,30,16,18,2,10,18,6,32,4,18,6,2,12,10,18,2,6,10,14,18,28,6,8,16,2,4,20,10,8,18,10,2,10,8,4,6,12,6,20,4,2,6,4,20,10,26,18,10,2,18,6,16,14,4,26,4,14,10,12,14,6,6,4,14,10,2,30,18,22,2,16,2,4,8,6,6,16,2,6,12,10,8,12,4,14,4,6,20,10,12,2,6,6,4,2,10,2,30,16,12,20,18,4,6,2,4,8,16,14,18,22,6,2,22,6,6,18,2,10,36,8,4,6,20,4,12,6,14,4,2,28,24,8,4,6,12,30,18,32,22,8,36,6,4,12,2,12,4,6,20,10,18,18,8,6,4,24,8,10,14,6,4,8,12,16,2,16,6,8,16,12,14,10,30,14,4,12,8,12,6,10,2,12,28,6,12,12,20,10,2,10,14,6,6,30,4,8,12,4,2,10,14,4,26,18,12,10,6,8,4,12,6,24,18,8,10,2,12,4,12,12,6,2,22,2,4,2,12,16,14,10,2,16,18,32,4,6,20,22,8,10,2,10,6,2,4,14,6,24,4,8,4,6,12,12,8,6,10,12,8,10,2,10,12,6,12,12,20,28,20,10,14,10,8,10,6,2,4,14,6,6,12,6,12,10,14,10,14,16,8,10,26,4,2,6,4,14,4,6,12,8,6,30,18,12,6,12,16,12,12,2,28,6,14,10,36,2,4,6,8,12,22,18,2,30,18,22,20,18,10,38,6,4,2,24,4,6,6,2,10,6,14,10,8,4,24,14,16,14,22,6,20,10,14,4,12,12,2,16,8,6,6,18,4,6,14,22,6,2,42,16,2,10,6,2,4,6,8,10,20,16,30,8,10,8,10,2,30,6,6,36,10,8,16,6,2,12,28,2,4,6,18,12,6,8,10,2,4,50,4,20,4,30,8,4,6,12,2,24,4,8,18,6,4,6,8,10,2,4,2,40,18,36,30,30,8,16,14,6,12,28,2,22,2,4,12,30,12,6,2,4,14,10,2,18,22,12,18,2,10,18,32,6,4,2,6,10,20,12,10,6,12,20,12,6,4,2,16,2,16,6,14,4,2,16,2,6,16,6,8,4,8,22,18,8,12,4,8,6,24,22,6,2,12,30,6,10,12,6,2,22,6,2,12,6,22,8,12,22,2,10,6,18,12,2,6,12,18,6,4,20,22,8,12,24,16,14,10,30,18,2,6,4,14,10,2,12,10,12,6,2,16,12,2,6,12,10,2,10,6,2,12,12,16,20,10,12,8,30,10,14,4,6,8,6,4,20,18,24,4,12,8,4,2,24,6,24,10,2,4,6,2,6,6,6,4,24,2,10,12,2,6,10,8,6,10,18,2,6,4,20,24,10,12,2,12,6,24,4,36,14,16,8,22,6,8,4,2,6,22,20,16,12,18,2,12,16,6,6,12,6,12,2,6,12,10,8,16,8,6,16,8,12,4,6,6,20,12,12,4,6,20,4,12,2,10,2,6,30,22,6,2,4,38,10,2,4,2,22,2,16,2,6,10,20,6,24,4,12,14,12,4,38,10,30,6,2,12,12,4,6,30,14,4,8,18,36,4,6,20,4,2,12,10,2,6,10,12,6,12,8,6,6,24,4,30,20,6,36,10,2,12,6,4,8,6,4,12,8,6,12,4,6,14,4,20,12,4,6,18,2,4,18,2,16,12,30,6,6,8,40,8,48,6,16,18,14,12,6,18,4,20,10,2,6,10,8,30,4,12,20,6,12,6,6,34,6,6,18,6,8,10,12,6,8,10,2,4,24,6,8,22,6,2,12,6,10,12,6,24,6,14,12,36,4,24,2,10,8,10,6,14,10,32,4,8,10,12,26,18,4,6,20,4,20,6,16,6,2,30,12,6,10,2,6,10,12,8,4,2,6,10,12,26,22,8,6,4,14,6,6,30,4,6,14,4,2,28,2,6,22,8,4,18,18,18,2,12,6,4,20,10,6,6,14,10,12,2,12,30,34,12,8,6,4,2,10,2,16,12,2,10,8,18,24,6,4,12,14,4,8,4,14,4,6,6,20,6,4,8,18,52,2,4,12,8,4,38,4,26,24,16,12,6,2,12,12,16,2,6,6,4,12,14,16,8,12,18,16,6,8,10,6,14,10,12,2,10,2,4,24,6,42,24,8,10,6,6,6,2,12,4,14,6,6,28,6,2,10,12,12,6,20,4,6,14,4,2,12,10,12,24,6,8,6,6,4,24,12,20,16,14,30,18,6,4,26,12,4,6,2,6,4,2,28,8,40,2,10,8,4,20,6,18,10,2,4,44,6,18,12,6,4,6,2,22,6,14,30,10,24,2,10,8,16,18,2,18,22,8,10,6,6,14,4,8,18,4,2,18,18,18,6,4,24,18,2,16,6,6,18,20,16,20,4,14,6,4,20,18,10,2,6,10,24,2,10,24,6,6,24,6,12,2,28,12,14,6,6,12,6,22,12,12,8,36,4,12,14,4,20,10,12,24,2,4,6,12,2,4,2,10,12,26,6,16,8,4,8,10,8,6,34,2,12,16,24,6,2,10,2,18,4,8,6,16,6,2,6,6,6,4,14,4,20,6,4,20,6,12,22,6,2,10,12,2,6,4,8,12,4,14,12,10,14,4,12,26,10,14,4,26,6,30,4,18,18,8,6,16,8,10,14,10,8,10,20,22,20,16,2,18,6,4,6,6,12,2,10,26,4,8,18,18,6,18,6,4,6,24,6,20,34,26,10,2,28,12,8,10,12,2,6,22,2,12,16,2,6,6,10,14,16,20,6,4,38,6,10,6,8,16,42,2,6,4,6,6,6,14,16,14,4,20,10,2,4,8,18,10,12,36,2,10,42,8,4,20,24,16,8,22,6,8,4,2,6,22,6,6,8,28,2,10,18,14,6,4,18,8,10,14,4,12,8,10,12,14,4,2,12,12,4,6,18,30,12,38,6,12,10,2,18,10,12,8,4,8,6,4,2,24,12,18,4,2,4,2,58,12,8,24,10,2,4,6,6,12,2,4,14,6,6,16,12,2,4,32,4,24,6,6,8,10,2,22,18,12,20,6,30,4,30,6,2,4,14,6,4,14,16,2,12,10,2,6,12,12,10,6,8,22,8,12,12,6,16,6,18,20,22,18,2,22,2,16,2,22,14,10,20,10,32,4,8,10,6,2,22,6,12,2,6,4,2,4,14,12,24,10,2,12,16,2,4,6,14,6,10,12,2,16,14,34,12,2,6,6,6,4,20,10,26,12,12,4,2,4,8,10,2,4,2,22,6,6,14,4,18,12,26,6,10,8,16,2,4,20,10,6,42,2,10,6,8,24,12,6,4,6,12,2,28,8,12,18,18,6,46,8,10,6,14,4,2,6,4,6,42,8,10,8,10,2,18,4,6,12,12,2,4,20,10,12,12,8,4,26,18,22,8,6,16,14,16,2,18,10,2,6,6,10,14,4,2,30,4,2,4,8,10,6,2,12,16,6,56,10,2,12,10,8,12,6,4,14,10,2,4,8,6,4,20,6,12,22,6,32,10,2,10,12,14,6,28,36,6,6,2,12,4,6,6,8,22,2,18,10,2,6,4,20,10,8,4,6,14,18,6,42,22,2,4,2,28,2,4,18,6,6,6,12,2,24,10,36,6,2,12,10,26,24,18,16,6,6,14,24,12,4,8,6,12,4,8,16,20,40,26,4,12,2,6,4,2,10,14,10,2,4,26,12,28,2,16,26,6,10,2,6,10,6,8,6,6,6,10,12,6,20,40,20,4,2,16,12,6,12,8,4,18,2,12,10,26,12,16,2,18,24,12,4,14,22,20,10,14,12,4,18,12,8,10,12,6,30,14,4,24,6,30,6,6,2,6,22,32,6,4,6,6,20,16,2,10,8,12,10,2,6,10,8,16,36,8,6,4,2,28,2,28,12,2,10,6,14,10,6,6,6,8,6,4,14,18,4,6,12,2,10,18,8,30,40,2,18,4,6,14,18,6,4,12,6,12,6,14,10,26,6,16,2,16,30,2,10,2,42,6,28,14,6,10,2,12,18,12,6,10,12,12,20,6,4,2,10,6,12,12,14,12,34,6,2,12,10,6,8,6,4,12,38,6,10,18,2,28,2,6,12,30,16,2,10,8,4,2,16,18,26,4,6,8,18,22,6,20,4,6,12,2,6,12,4,18,6,2,22,12,8,6,16,18,30,12,24,2,10,2,6,6,4,6,36,14,6,22,2,58,8,12,6,10,2,40,8,6,28,2,4,14,6,6,18,10,8,4,14,4,8,30,4,6,8,6,6,18,4,2,4,14,12,18,10,2,4,12,2,10,8,10,14,10,18,12,8,6,10,14,10,8,22,2,6,22,12,6,8,12,28,2,48,12,4,18,8,10,14,10,14,4,12,30,24,6,8,6,4,8,,4,2,10,12,8,10,12,12,18,2,24,4,8,22,12,20,4,12,2,12,16,2,28,2,6,24,10,2,28,2,4,20,4,12,6,14,4,6,14,22,24,20,4,14,6,6,10,30,8,10,18,2,6,6,16,2,6,6,4,2,24,4,2,24,10,6,2,10,2,6,22,8,4,8,6,4,18,2,18,4,8,16,26,4,6,8,22,20,16,8,4,6,24,6,14,12,16,2,12,4,14,10,2,4,12,18,32,10,14,24,12,40,8,34,12,14,4,18,2,28,12,20,6,10,2,40,18,14,12,4,36,6,2,22,6,14,10,24,42,2,16,2,34,8,6,4,2,4,14,40,8,12,6,24,18,4,6,2,6,4,2,4,2,24,10,8,6,6,10,14,6,16,18,14,18,24,4,6,6,8,4,20,10,6,12,2,12,4,14,6,6,6,4,14,16,36,14,6,4,14,4,6,24,8,4,20,10,14,12,34,8,10,6,6,6,14,4,14,12,6,10,18,14,10,12,6,2,6,6,28,2,4,24,6,2,4,8,16,6,20,4,2,10,2,10,8,,6,8,12,4,14,12,10,2,12,6,10,18,24,6,2,10,8,6,16,20,4,14,6,6,12,6,4,6,2,4,8,22,6,8,4,2,16,18,14,6,22,14,10,14,4,6,2,4,14,10,12,8,16,8,10,8,24,40,6,12,2,6,18,4,2,4,30,2,30,4,8,18,12,12,4,2,4,14,36,16,18,2,12,10,6,12,18,2,18,6,6,22,18,38,6,10,18,2,10,8,6,16,24,14,6,4,6,14,16,24,6,12,8,12,10,14,46,2,16,2,22,6,2,10,2,10,2,6,4,20,10,6,30,8,6,6,4,30,8,6,6,6,22,36,2,4,8,6,6,4,14,12,10,20,4,2,4,30,6,14,16,12,30,2,4,6,8,30,10,8,34,18,12,8,22,20,4,14,10,20,6,4,2,10,14,4,26,6,36,12,18,4,8,6,4,6,2,28,6,6,24,8,10,26,6,24,4,8,24,10,20,4,2,10,14,16,2,6,6,4,6,8,18,28,14,6,16,14,6,4,6,6,8,4,2,4,12,2,12,6,12,28,2,6,12,10,14,4,44,6,10,2,12,12,30,4,12,2,6,10,12,2,10,2,10,6,8,10,6,14,16,8,6,12,10,2,10,8,12,10,18,8,4,2,4,26,6,22,6,14,10,6,2,28,6,8,46,6,6,18,6,6,8,6,10,18,2,6,12,18,10,8,12,30,10,2,10,2,4,6,18,2,4,20,12,4,6,8,34,6,6,24,12,8,36,16,2,6,4,2,4,6,20,6,24,4,2,4,18,20,6,22,8,46,18,2,16,20,22,2,24,22,2,16,24,20,16,2,4,8,10,2,10,14,4,8,18,4,8,4,14,10,2,24,16,8,6,16,20,10,2,6,4,30,2,16,32,6,12,10,24,8,12,18,16,2,12,6,4,12,6,2,28,18,2,22,6,6,6,2,6,16,14,6,30,16,2,10,2,4,12,2,12,10,14,6,10,8,28,2,36,6,16,14,4,20,24,6,4,8,4,18,8,4,14,4,6,2,24,16,14,4,26,16,2,10,32,6,4,6,12,6,36,8,12,4,2,4,8,6,4,20,12,10,24,12,2,12,10,6,12,2,6,18,4,6,6,6,8,24,6,10,12,30,14,10,8,12,6,10,12,2,18,6,4,8,4,24,20,4,8,10,12,8,12,16,6,14,4,8,4,18,50,6,6,4,6,8,6,10,26,10,6,2,10,2,10,6,38,12,4,8,10,20,6,6,6,18,10,2,12,16,2,12,12,4,26,10,6,20,18,40,12,8,10,12,2,18,12,10,2,10,26,4,6,12,8,4,30,6,2,6,16,24,24,18,12,12,8,6,4,8,10,8,6,4,20,10,26,4,24,6,2,12,42,18,6,4,26,6,28,6,2,10,8,6,6,10,8,10,2,22,2,4,20,4,6,36,14,4,20,22,6,14,6,10,8,4,2,4,14,18,34,8,22,14,10,24,6,2,10,2,6,10,26,18,10,18,24,18,2,24,40,2,4,6,2,6,10,26,6,12,12,6,4,36,2,10,12,24,2,4,8,10,6,2,4,24,2,4,36,2,22,14,24,18,42,6,10,2,24,16,12,2,4,2,10,2,10,8,4,36,8,4,12,18,6,6,14,22,2,6,24,6,10,24,20,22,6,14,36,28,6,8,6,24,6,12,28,2,18,4,2,4,20,22,8,10,2,18,4,8,10,14,10,6,8,6,6,12,16,12,14,10,18,2,10,24,24,6,12,2,22,6,20,22,2,4,12,2,6,36,6,22,6,2,28,12,18,2,4,14,6,4,2,10,2,16,2,10,8,6,10,18,12,6,14,4,6,18,12,26,4,6,14,6,10,12,2,4,2,10,24,8,10,32,10,8,10,6,2,18,12,28,30,2,18,4,6,14,6,4,8,22,8,30,18,10,26,4,2,22,8,4,8,6,4,26,4,12,20,18,6,12,10,18,2,4,6,2,12,28,6,20,6,16,8,6,6,4,6,20,12,6,4,20,6,16,6,32,10,18,2};

    int i=0, N;
    scanf("%d", &N);
    if(N>=99991){
        printf("1224");
        return 0;
    }
    while (a[i] <= N){
        i++;
    }
    i-=2;
    int sum = 0;
    for(int j=0; j<=i; j++){
        if(b[j] == 2) sum++;
    }
    printf("%d", sum);
    return 0;
}