using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        new Magatro().Solve();
    }
}

public class Magatro
{
    private long N = long.Parse(Console.ReadLine());
    long Mod = 1000000000000;
    public void Solve()
    {
        if (N > 100)
        {
            Console.WriteLine(string.Format(new string('0', 12)));
        }
        else
        {
            long ans = 1;
            bool flag = false;
            for(long i = 1; i <= N; i++)
            {
                ans *= i;
                if (ans >= Mod)
                {
                    flag = true;
                }
                ans %= Mod;
            }
            if (flag)
            {
                Console.WriteLine("{0:D12}", ans);
            }
            else
            {
                Console.WriteLine(ans);
            }
        }
    }
}