#include <string>
#include <vector>
#include <iostream>

using namespace std;

int zero,one,two;

int pl(int a){
  string s;
  int model = a;
  while(s.size() <= a){
    s.push_back('.');
  }
  return s.size();
}

int main() {
  int n;
  cin >> n;
  string s;
  
  zero = s.size();
  s.push_back('t');
  one = s.size();
  s.push_back('t');
  two = s.size();
  
  int now = two;
  bool ok = false;
  while(now != n){
    if(n==1) break;
    if(!(n%now)) {cout << "NO" << endl;ok = true;break;}
    now = pl(now);
  }
  if(ok == false) cout << "YES" << endl;
}