/*
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 * and open the template in the editor.
 */

import java.util.ArrayList;
import java.util.Scanner;

/**
 *
 * @author vaskol
 */
public class mortgage {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        String vstup = "";
        ArrayList<String> zoz = new ArrayList<String>();
        Scanner scan = new Scanner(System.in);
        vstup = scan.nextLine();

        while (vstup.compareTo("0 0 0 0") != 0) {
            zoz.add(vstup);
            vstup = scan.nextLine();
        };
        
        
        for (String jeden : zoz) {
            String[] vysledok = jeden.split(" ");
            int x = Integer.parseInt(vysledok[0]);
            int s = Integer.parseInt(vysledok[1]);
            int pocet = Integer.parseInt(vysledok[2]);
            float dan = Float.parseFloat(vysledok[3]);
            float pompocet = x;
            boolean help = false;
           
            for(int i=0;i< pocet*12;i++){
              
                pompocet = pompocet - s;
                pompocet += (pompocet*(dan/100/12));
                if(pompocet <= 0) {System.out.println("YES");help = true;break;}
                
            }
            if(help == false) System.out.println("NO");
            
           
        }
    }
}