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

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    constexpr int r = 2000;
    vector<bool> tb(r + 1);
    for(int i = 2; i <= r; i++){
        if(tb[i]) continue;
        for(int j = 2 * i; j <= r; j += i) tb[j] = true;
    }
    int a, b;
    cin >> a >> b;
    cout << (!tb[100 * a + b] ? "Yes" : "No") << '\n';
}