using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication22
{
    class Program
    {
        static int faktorialis(int n)
        {
            if (n <= 1) { return 1; }
            return n * faktorialis(n - 1);
        }
        static void Main(string[] args)
        {
            Console.WriteLine(faktorialis(5));
        }
    }
}