#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cmath>
#include <map>
#include <cstdio>

int main() {
	int n;

	std::cin >> n;

	bool flag = false;

	if (n == true) {
		flag = true;
	}
	
	for (int i = (true << true); i < n;i = (i & true) << true)
	{
		if (!(n % i)) {
			flag = true;
		}
	}

	if(flag) std::cout << "NO" << std::endl;
	else std::cout << "YES" << std::endl;
}