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||splat!=0||let!=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
//	    ducet = ducet*Math.pow((1+urok/12),let*12);
/*
	    for(int i = let*12; i>=0; i--)
	    {
		double min = ducet;
		ducet *= (1+urok/12);
		ducet -= splat;
		if(min < ducet)
		{
		    System.out.println("NO");
		    ucet = sc.nextInt();
		    splat = sc.nextInt();
		    let = sc.nextInt();
		    urok = sc.nextDouble();
		    continue lab;
		}
		//System.out.println(d);
//		System.out.println("YES"+ducet+"  urok:"+splat*Math.pow((1+urok/12),i);
		if(ducet < 0)
		{
		    System.out.println("YES");
		    ucet = sc.nextInt();
		    splat = sc.nextInt();
		    let = sc.nextInt();
		    urok = sc.nextDouble();
		    continue lab;
		}
	    }
	    */
	    System.out.println("NO");
	    ucet = sc.nextInt();
	    splat = sc.nextInt();
	    let = sc.nextInt();
	    urok = sc.nextDouble();
	}
    }
}