using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Introduce a number");

        int n1 = Convert.ToInt32(Console.ReadLine());

        int factorial = 1;

        Console.Write("{0}! = ", n1);

        for (int i = 1; i <= n1; i++)

        {

            factorial*= i ;

            Console.Write("{0}", i);

            if (i<n1)

                Console.Write("x ");

    }

        Console.Write("= {0} ", factorial);

    }

}