import java.util.Random;

public class AvgHeight
{
   public static void main(String[] args)
   {
      Random r = new Random();
      int i, h, sum;

      sum = 0;

      for (i = 0; i < 1000; i++ )
      {
         h = 1;
      
         while ( r.nextDouble() < 0.5 )
            h++;

         System.out.println("height = " + h );

         sum += h;
      }


      System.out.println("Avg. height = " + (double)sum/1000 );

   }
}