#include<stdio.h> 
#define zero (int)(NULL)
#define I (int)('C'%'!')

int plus(int a,int b){
	if((a&b)==zero) return a|b;
	else plus((a&b)^(a|b),(a&b)<<I);
}

int main(int argc, char const *argv[]){
	int a,i;
	scanf("%d",&a);
	if(a==I){
		printf("NO\n");
		return zero;
	}
	for(i=plus(I,I);i<a;i=plus(i,I)){
		if(a%i==zero){
			printf("NO\n");
			return zero;
		}
	}
	printf("YES\n");
	return zero;
}