#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  while (n % 2 == 0) {
    n = n / 2;
  }
  if (n == 1) {
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
  return 0;
}
