using System;  

public class Exercise15  

{  

    public static void Main()

{

  int i,f=1,num;

    Console.Write("\n\n");

    Console.Write("Calculate the factorial of a given number:\n");

    Console.Write("--------------------------------------------");

    Console.Write("\n\n");  

​

  Console.Write("Input the number : ");

   num= Convert.ToInt32(Console.ReadLine()); 

  for(i=1;i<=num;i++)

      f=f*i;

​

  Console.Write("The Factorial of {0} is: {1}\n",num,f);

 }

}

​

​