import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;


public class mortgage {
	
	public static void main(String[] args) throws Exception
	{
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		
		while(true)
		{
			String s = in.readLine();
			String[] xxx = s.split(" ");
			
			double X = Double.parseDouble(xxx[0]);
			double Y = Double.parseDouble(xxx[1]);
			double N = Double.parseDouble(xxx[2]);
			double r = Double.parseDouble(xxx[3]) / 100;
			if (X == 0) break;
			
			double a = r / 12.0;
			double m = N * 12;
			
			double pow = Math.pow(1 + a, m);
			double res = X * pow - Y * (pow - 1)/(a);
			//System.out.println(res);
			
			if (res > 0)
				System.out.println("NO");
			else {
				System.out.println("YES");
			}
			
		}
	}

}