import java.util.*;
public class hasnextex
{
  static Scanner kb = new Scanner(System.in);
  public static void main(String[] args)
  {

    // number entered and the running total
    int inputNum, sum = 0;

    // count of valid and invalid numbers seen
    int numValid = 0, numInvalid = 0;
    double average;


    System.out.print("Enter a positive value (EOF to quit): ");
    while ( kb.hasNext() )
    {
      inputNum = kb.nextInt();
      if (inputNum >= 0) //If the number inputted is greater than or equal to zero
      {
        sum = sum + inputNum; // add the number to the total running sum
        numValid = numValid + 1; //increase the number of valid numbers entered by one
      }
      else
      {
        System.out.println("The number " + inputNum + " is invalid."); //negative numbers are invalid, so alert the user
        numInvalid = numInvalid + 1; //increase the number of invalid numbers enterd by 1
      }
      System.out.print("Enter a positive value (EOF to quit): ");
    }

    average = sum / numValid; //divide the total sum of all the numbers entered by the total number of valid numbers entered

    System.out.println("There were " + numValid + " valid numbers entered");
    System.out.printf("The sum of the valid numbers was %d and the average was %.2f.%n", sum, average);
     //the %d is saying, "print the first int mentioned
     //after the quotes here". The %.2f is saying, "print the
     //first float value mentioned after the quotes here, but
     // only to the first 2 decimal points." The %n is saying nextline.
    System.out.println("There were " + numInvalid + " invalid numbers");
  }
}