#include <bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for (ll i = a; i < b; i++)
using ll = long long;

int main(){
    int m, d;
    cin >> m >> d;
    int n = m * 100 + d;
    vector<int> v(n + 1, 1);
    for(int i = 2; i * i <= n; i++) {
        if(v[i] == 0) continue;
        for(int j = i + i; j <= n; j += i) v[j] = 0;
    }
    string ans = "Yes";
    if(v[n] == 0) ans = "No";
    cout << ans << endl;
}