Need help with this EOF based and running total loop?

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:

Code:

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!