#include <math.h>
#include <iostream>

using std::cin;
using std::cout;
using std::endl;

double formulka(double castka, double urok, double splatka, int mesicu) {
        const double r = (urok + 100.0) / 100.0;
        return castka * pow(r, mesicu) - splatka * ((1 - pow(r, mesicu)) / (1 - r));
}

bool splaceni(double vstupnicastka, double urok, double splatka, int roku) {
    double novacastka = formulka(vstupnicastka, urok, splatka, roku * 12);
    if (novacastka <= 0) {
        return true;
    }

    return false;

}

int main() {

    int x;
    int y;
    int n;
    double r;

    cin >> x;
    cin >> y;
    cin >> n;
    cin >> r;

    while (! (x == 0 && y == 0 && n == 0 && r == 0)) {
        if( splaceni(x, r / 12, y, n) ) {
            cout << "YES" << endl;
        } else {
            cout << "NO" << endl;
        }

        cin >> x;
        cin >> y;
        cin >> n;
        cin >> r;
    }
}