using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter a number: ");

        int num = int.Parse(Console.ReadLine());

        int sum = 1;

        while(num>0){

        Console.Write(num + " * ");

        sum *= num;

        num--;

    }

        Console.WriteLine("\nSum = " + sum);

}

}