/* -*- coding: utf-8 -*-
 *
 * 3708.cc:  No.3708 Uncommon Time - yukicoder
 */

#include<cstdio>
#include<vector>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_P = 1231;

/* typedef */

using vb = vector<bool>;

/* global variables */

vb primes;

/* subroutines */

void gen_primes(int maxp) {
  primes.assign(maxp + 1, true);
  primes[0] = primes[1] = false;

  for (int p = 2; p * p <= maxp; p++)
    if (primes[p]) {
      for (int q = p * p; q <= maxp; q += p) primes[q] = false;
    }
}

/* main */

int main() {
  gen_primes(MAX_P);

  int m, d;
  scanf("%d%d", &m, &d);

  int x = m * 100 + d;
  if (primes[x]) puts("Yes");
  else puts("No");
  
  return 0;
}