#include <deque>
#include <iostream>
#include <numeric>
using namespace std;

int main() {
  int N;
  cin >> N;
  deque<int> A;
  iota(A.begin(), A.end(), !N);
  A.pop_front();
  A.pop_front();
  for (int x : A) {
    if (!(N % x)) {
      cout << "NO" << endl;
      goto END;
    }
  }
  cout << "YES" << endl;
END:;
}