/**
   @version 1.10 1999-12-17
   @author Cay Horstmann
*/

import javax.swing.*;

public class Retirement
{
   public static void main(String[] args)
   {
      // read inputs
      String input = JOptionPane.showInputDialog
         ("How much money do you need to retire?");
      double goal = Double.parseDouble(input);

      input = JOptionPane.showInputDialog
         ("How much money will you contribute every year?");
      double payment =  Double.parseDouble(input);

      input = JOptionPane.showInputDialog
         ("Interest rate in %:");
      double interestRate =  Double.parseDouble(input);

      double balance = 0;
      int years = 0;

      // update account balance while goal isn't reached
      while (balance < goal)
      {
         // add this year's payment and interest

         balance += payment;
         double interest = balance * interestRate / 100;
         balance += interest;
         years++;
      }

      System.out.println
         ("You can retire in " + years + " years.");
      System.exit(0);
   }
}