import java.util.Scanner;

public class Test
{
     public void main( String arg[] )
     {
         Scanner input = new Scanner( System.in )
  
          int grade;
          int gradeCounter;
          int total = 0;
          int average;
          int minimum;
          int maximum;

          System.out.print( "Enter grade or -1 to quit: " );
          grade = input.nextInt();

           while ( grade != -1 )
           {
                total = total + grade;
                gradeCounter = gradeCounter + 1;

                 System.out.print( "Enter grade -1 to quit: " );
                 grade = input.nextInt();
             } // end while

            if ( gradeCounter != 0 )
            {
                 average = total / gradeCounter;
          
                  System.out.printf ( "Average is: %2f\n", average );
             } // end if

             else
                 System.out.println( "No grades were entered" );