using System;

​

public class Program

{

    public static void Main()

    {

        restart:

            start:

                Console.WriteLine("Please enter a whole number.");

        string input = Console.ReadLine();

        ulong n;

        if (ulong.TryParse(input, out n))

        {

            for (ulong i = 1; i < 100; i++)

            {

                ulong r = n % i;

                if (r == 0)

                {

                    Console.WriteLine(n + " is divisible by " + i + ".");

                }

            }

        }

        else

        {

            Console.Clear();

            Console.WriteLine("You didnt enter a whole number, please enter again.");

            goto start;

        }

​

        Console.WriteLine("If you would like to restart the program enter 'Y'. To quit, click any other key.");

        string choice = Console.ReadLine();

        if (choice == "Y" || choice == "y")

        {

            Console.Clear();

            goto restart;

        }

​

        Console.Clear();

    }

}