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

int main() {
    long long a,b,c,d;
    cin >> a >> c >> b >> d;
    map<long long,long long>mp1,mp2;
    for(long long i = 2; i*i <= a; i++) {
        while (a%i == 0) {
            mp1[i] += c;
            a /= i;
        }
    }
    if(a > 1) {
        mp1[a] += c;
    }
    for(long long i = 2; i*i <= b; i++) {
        while (b%i == 0) {
            mp2[i] += d;
            b /= i;
        }
    }
    if(b > 1) {
        mp2[b] += d;
    }
    bool f = true;
    for(auto i:mp2) {
        if(mp1[i.first] < i.second) {
            f = false;
        }
    }
    cout << ((f)?"Yes":"No") << endl;
}