using System;

namespace FactCalc
{
    class Program
    {
        static void Main(string[] args)
        {
            decimal n = decimal.Parse(Console.ReadLine());
            decimal f = Ncalc(n);
            Console.WriteLine( Formater(f) );
        }

        private static string Formater(decimal f)
        {
            string s = f.ToString("#");
            if (s.Length > 12)
            {
                s = s.Substring(s.Length - 12, 12);
            }
            return s;
        }

        private static decimal Ncalc(decimal n)
        {
            if( n < 50 )
            {
                for (decimal i = n - 1; i > 1; i--)
                {
                    n *= i;
                }
            }
            else
            {
                n = 1000000000000;
            }
            return n;
        }
    }
}