import java.util.Scanner;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
/**
 *
 * @author cteam063
 */
public class mortgage {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int x = scanner.nextInt();
        int y = scanner.nextInt();
        int n = scanner.nextInt();
        double r = scanner.nextDouble();
        while (!(x == 0 && y == 0 && n == 0 && Math.abs(r) < 0.000001)) {
            if (splaceni(x, r / 12, y, n)) {
                System.out.println("YES");
            } else {
                System.out.println("NO");
            }
            x = scanner.nextInt();
            y = scanner.nextInt();
            n = scanner.nextInt();
            r = scanner.nextDouble();
        }

    }

    public static boolean splaceni(double castka, double urok, double splatka, int roku) {
        for (int i = 0; i < roku; i++) {
            for (int j = 0; j < 12; j++) {
//                System.out.println("DEBUG> " + castka + " " + i + " " + j + "\n");
                castka = nextMonth(castka, urok, splatka);
                if (castka <= 0) {
                    return true;
                }
            }
        }
        return false;
    }

    public static double nextMonth(double castka, double urok, double splatka) {
        return castka * ((100 + urok) / 100) - splatka;
    }
}