#include <stdio.h>
#include <malloc.h>
#include <stdint.h>

char str[60000];
int str_len = 0;

/// <summary>
/// 入力された数字を返す
/// </summary>
/// <returns></returns>
int ReadNum() {
	int negate = 0;
	char c = getchar();
	int num = 0;
	int numCnt = 0;
	while (c != '\n') {
		if (c == '-') {
			negate = 1;
		}
		else {
			num = num * 10 + c - '0';
		}

		c = getchar();
	}
	if (negate == 1) {
		num *= -1;
	}
	return num;
}

int isPrime(uint64_t num) {
	for (uint64_t i = 2;i < num;i++) {
		if (num % i == 0) return 0;
	}
	return 1;
}

int isUseful(uint64_t num) {
	for (uint64_t i = 2;i < num;i++) {
		if (isPrime(i));
		if (num % i == 0) return 1;
	}
	return 0;
}

int main()
{
	int num = ReadNum();
	if (isUseful(num)) {
		printf("YES\n");
	}
	else {
		printf("NO\n");
	}
}