Need help with this EOF based and running total loop?

[KoolKat]

Hi, here are the instructions for the project I have to do:
http://pastebin.com/n7wyyDWA

I'm new to java and I'm trying my best to figure this out on my own, but after about 6 hours of trying, my brain is a bit fried. I'd like to know what I'm doing wrong and what I need to add.
Here is what I have so far:

import java.util.*;
public class p5
{
  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.println("Enter a positive value (Ctrl-D to quit): ");
    while ( kb.hasNext() )
    {
      inputNum = kb.nextInt();
      if ( inputNum < 0 )
        System.out.println("The number " + inputNum + " is invalid.");
      
      
      else
        
        System.out.println("Enter a positive value (Ctrl-D to quit): ");
    }                    
    // System.out.println("The sum of the valid numbers was " + sum + " and the average was " + average + ".");
  }
}

I know I need the valid and invalid numbers to add up and create a sum and average, but I have no idea how to do that.

If anyone could shed some light, I'd really like to learn about what I'm doing wrong/right and not just be given the answer. I don't want to seem like I'm cheating, I just need some guidance.

Thanks!

[Norm]

I'd like to know what I'm doing wrong

Please explain why you think there is something wrong.
Copy any output here and add some comments about what is wrong and show what you want the output to be.