#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  if (n == 1) {
    cout << "YES";
    return 0;
  }
  int prime[94] = {3,   5,   7,   11,  13,  17,  19,  23,  29,  31,  37,  41,
                   43,  47,  53,  59,  61,  67,  71,  73,  79,  83,  89,  97,
                   101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157,
                   163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227,
                   229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283,
                   293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367,
                   373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439,
                   443, 449, 457, 461, 463, 467, 479, 487, 491, 499};
  for (int i = 0; i < 94; i++) {
    if (n % prime[i] == 0) {
      cout << "NO";
      return 0;
    }
  }
  if (n % 2 == 0)
    cout << "YES";
  else
    cout << "NO";
  return 0;
}
