import java.io.*;
   import java.text.DecimalFormat;

    public class WinPercentage
   {
      /***********************************************************
       * Computes the percentage of games won by a team.
       ***********************************************************/
   	   
      static BufferedReader keyboard = new BufferedReader 
      		(new InputStreamReader(System.in));
      static final int NUM_GAMES = 12;
   		
       public static void main (String[] args) throws IOException
      {
         int won;
         double ratio;
         DecimalFormat fmt = new DecimalFormat ("0.00");
      
         // initialize the loop control variable
         System.out.print ("Enter the number of games won (0 to "
                        + NUM_GAMES + "): ");
         won = Integer.parseInt(keyboard.readLine());
      
         while (won < 0 || won > NUM_GAMES) {
            // invalid input -- initialize the loop control variable
            System.out.print ("Invalid input. Please reenter: ");
            won = Integer.parseInt(keyboard.readLine());
         }
      
      	 // compute winning percentage
         ratio = (double)won / NUM_GAMES;
		
         // output result to user
         System.out.println ("\nWinning percentage: " + 
  			     fmt.format(ratio*100) + "%");
      }
   }