import java.util.*;

public class mortgage
{
    public static void main(String[] args)
    {
	mortgage t = new mortgage();
	t.test();
	
    }
    public void test()
    {
	
	Scanner sc = new Scanner(System.in);
	sc.useLocale(java.util.Locale.US);
	int ucet = sc.nextInt();
	int splat = sc.nextInt();
	int let = sc.nextInt();
	double urok = sc.nextDouble();
	urok = urok/100;
	lab:while(ucet!=0)
	{
	    double ducet = (double)ucet;
	    //double zaplat = splat*(1-Math.pow((1-urok/12),let*12))/(1-(1-urok/12));
	    //System.out.println(zaplat-ducet);
	    if(zaplat>=ducet)System.out.println("YES");
	    else System.out.println("NO");
	    ucet = sc.nextInt();
	    splat = sc.nextInt();
	    let = sc.nextInt();
	    urok = sc.nextDouble();
	}
    }
}