import java.util.Locale;
import java.util.Scanner;

public class mortgage {
	public static boolean[] zvetsovac(boolean[] pole){
	    boolean[] nove = new boolean[2*pole.length];
		for(int i=0;i<pole.length;i++){
			nove[i] = pole[i];
		}
		return nove;
	}
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		sc.useLocale(Locale.US);
		double x = sc.nextDouble();
		double y = sc.nextDouble();
		double n = sc.nextDouble();
		double r = sc.nextDouble();
		
		boolean[] vysledky = new boolean[8];
		int j=0;
		
		while(x!=0 && y!=0 && n!=0 && r!=0){
			for(int i=0;i<n*12;i++){
				x*=(1+r/1200);
				x-=y;
				if(x<=0){
					if(j>=vysledky.length){
						vysledky=zvetsovac(vysledky);
					}
					vysledky[j] = true;
					break;
				}
			}
			j++;
			x = sc.nextDouble();
			y = sc.nextDouble();
			n = sc.nextDouble();
			r = sc.nextDouble();
		}
		

		for(int i=0;i<j;i++){
			System.out.println(vysledky[i] ? "YES" : "NO");
		}
		
	}
}