#include <bits/stdc++.h>
using namespace std;
using u64 = uint64_t;

int main(){
    u64 X, A, Y, B;
    cin >> X >> A >> Y >> B;
    auto factor = [](u64 x){
        unordered_map<u64, u64> a;
        while(x % 2 == 0){
            a[2]++;
            x /= 2;
        }
        for(u64 y = 3; y * y <= x; y++) while(x % y == 0){
            a[y]++;
            x /= y;
        }
        if(x != 1) a[x] = 1;
        return a;
    };
    auto fx = factor(X), fy = factor(Y);
    puts(all_of(fy.begin(), fy.end(), [&](pair<u64, u64> y){ return y.second * B <= fx[y.first] * A; }) ? "Yes" : "No");
}