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

int main() {
    int n, m;
    for (int i = 0; i < n; i++) {
        int x;
        cin >> x;
        m /= __gcd(m, x);
    }
    if(m == 1)
    cout << "YES\n";
    else cout << "NO\n";
}