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

int main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    long long X, A, Y, B, extra = 0; cin >> X >> A >> Y >> B;
    if(X % Y == 0) {
        if(A >= B)  cout << "Yes" << endl;
        else {
            extra = B / A;
            if(B % A != 0)  extra++;
            long long power = pow(Y, extra);
            if(X % power == 0)  cout << "Yes" << endl;
            else    cout << "No" << endl;
        }
    } else { 
        cout << "No" << endl;
    }
    return 0;
}