#include <iostream>
using namespace std;

int main() {
	int n;
	cin >> n;
	
	int a = 1;
	while (a < n) {
		a = a * 2;
	}
	
	if (a == n) {
		cout << "YES";
	} else {
		cout << "NO";
	}
	
	return 0;
}