#30daysofcode #day9

//https://www.hackerrank.com/challenges/30-recursion

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution
{

    static int factorial(int n)
    {
        // Complete this function
        int outputNumber = 1;

        if(n > 1)
        {
            outputNumber = n * factorial(n - 1);
        }

        return outputNumber;
    }

    static void Main(String[] args)
    {
        int n = Convert.ToInt32(Console.ReadLine());
        int result = factorial(n);
        Console.WriteLine(result);
    }
}