import java.util.Scanner;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author louma
 */
public class mortgage {
    
    public static void main(String[] args) {
        
        
        Scanner a = new Scanner(System.in);
        while (true)
        {
            String line = a.nextLine();
            if (line.equals("0 0 0 0") == true)
                break;
            
            int pos = line.indexOf(" ");
            // X
            int pozicka = Integer.parseInt(line.substring(0, pos));
            ++pos;
            int pos2 = line.indexOf(" ", pos);
            // Y
            int splatka = Integer.parseInt(line.substring(pos, pos2));
            pos = pos2;
            ++pos;
            pos2 = line.indexOf(" ", pos);
            // N
            int splatnost = Integer.parseInt(line.substring(pos, pos2));
            pos = pos2;
            ++pos;
            // R
            double urok = Double.parseDouble(line.substring(pos));
            
            urok = 1 + urok / 1200;
            
            double a1 = pozicka * urok - splatka;
            
            if (splatka < (a1 - pozicka))
            {
                System.out.println("NO");
                continue;
            }
            
            double a2 = a1 * urok - splatka;
            
            double q = (a1 - a2) / (pozicka - a1);
            /* */
            
            double a0 = pozicka - a1;
            
            double spoluZaplatene = a0 * (Math.pow(q, splatnost * 12 - 1) - 1) / (q - 1);
            if (spoluZaplatene < pozicka)
                System.out.println("NO");
            else
                System.out.println("YES");
            
            /*
            double a2 = a1 * urok;
            double q = a2 / a1;
            
            double spoluZaplatene = pozicka * (Math.pow(q, splatnost) - 1) / (q - 1);
            if (spoluZaplatene < splatka)
                System.out.println("NO");
            else
                System.out.println("YES");
             */
            /*
            else
            {
                urok /= 1200;
                dlzoba = pozicka;
                for (int i = 0; i < 12 * splatnost; i++)
                {
                    dlzoba = dlzoba * (1 + urok) - splatka;
                    if (dlzoba <= 0)
                    {
                        System.out.println("YES");
                        break;
                    }
                }
                
                if (dlzoba > 0)
                    System.out.println("NO");
            }
             */
        }
    }
}