using System;

public class Program

{

    public static void Main()

    {

        int n,i,p=1;

        Console.WriteLine("enter the integer");

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

        Console.WriteLine("factorial of the given number is :\n");

        for(i=2;i<=n;i++)

        {

            p=p*i;

        }

        Console.WriteLine("{0}",p);

    }

}