#include <bits/stdc++.h>
#ifdef LOCAL
#include "./debug.cpp"
#else
#define debug(...)
#define print_line
#endif
using namespace std;
using ll = long long;

void calc(ll X, ll A, map<ll, ll>& mp) {
    ll nX = X;
    for (ll i = 2; i * i <= nX; i++) {
        if (X % i != 0) {
            continue;
        }
        ll res = 0;
        while (X % i == 0) {
            X /= i;
            res++;
        }
        res *= A;
        mp[i] = res;
    }
    if (X != 1) {
        mp[X] = A;
    }
}

int main() {
    ll X, Y, A, B;
    cin >> X >> A >> Y >> B;

    map<ll, ll> mp1, mp2;
    calc(X, A, mp1);
    calc(Y, B, mp2);

    bool ans = true;
    for (auto [k, v] : mp2) {
        if (mp1[k] < v) {
            ans = false;
        }
    }

    puts(ans ? "Yes" : "No");
}