using System;

public class Program

{

    public static void Main()

    {

        Start:

        Random numberGenerator = new Random ();

        int num01 = numberGenerator.Next(1,11);

        int num02 = numberGenerator.Next(1,11);

        Console.WriteLine ("What is " + num01 + " times " + num02 + "?");

            int answer = Convert.ToInt32 (Console.ReadLine());

            if (answer == num01 * num02)

        {

            int responseIndex = numberGenerator.Next(1,4);

            switch (responseIndex)

            { 

                case 1:

                    Console.WriteLine ("Great Job");

                    break;

                default:

                    Console.WriteLine ("Keep up the good work");

                    break;

            }

        }

        else 

        {

            int diff = Math.Abs (answer = (num01 * num02));

            if (diff >= 1) {

                Console.WriteLine("Too Low. Try again.");

            } else if (diff <= 10) {

                Console.WriteLine ("A little bigger");

            } else {

                Console.WriteLine ("Pretty clolse");

            }

        }

        goto Start;

    }}