#include <stdio.h>
#include <math.h>

int main(void) {
	unsigned long long int i = 0;
	unsigned char is_prime = 1;
	unsigned long long int n = 0;

	scanf("%lld", &n);
	for ( i=2; i<=sqrt(n); i++ ) {
		if ( !(n % i) ) {
			is_prime = 0;
			break;
		}
	}
	if ( is_prime ) {
		printf("NO\n");
	}
	else {
		printf("YES\n");
	}
	return 0;
}