using System;

public class Program

{

    public static void Main()

    {

        //lUIS dibe

        int e;

        int total = 1;

        Console.Writeline("Hello write anumber and i´ll tell you its factorial");

        e = int.Parse(Console.Readline());

        for (int i = 1; i<=e; i++)

        {

            total = total*i;

        }

        Console.Writeline(e + "! = " +total);

    }

}