using System;

public class Program

{

    public static void Main()

    {

    start:

    Console.Clear();

    Console.WriteLine("Please enter one number under 200000");

    ulong number = ulong.Parse(Console.ReadLine());

    if (number > 10000000000000)

        goto start;

    else

    {

        ulong ans = number;

    for (ulong i=1;i<=6;i++)

    {ans *=i;}

    Console.WriteLine(number + "! = " + ans);

    Console.WriteLine("Would you like to run the program again? Type \"y\" if yes.");

    string choice = Console.ReadLine();

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

        goto start;

    }

    }

}