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 - 1 < 2) return n;
            return Ncalc(n - 1) * n;
        }
    }
}