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

namespace yukicoder
{
	public class Program
	{
		public static void Main()
        {
			var n = long.Parse(Console.ReadLine());
            if (n < 60)
            {
				Console.WriteLine(factorial(n));
			}
            else
            {
				Console.WriteLine("000000000000");
            }
        }
		static string factorial(long a)
		{
			long f = 1;
			var b = (long)Math.Pow(10, 12);
			var c = true;
			while (a > 0)
            {
				f *= a;
                if (f > b)
                {
					f %= b;
					c = false;
				}
				a--;
            }
            if (c)
            {
				return f.ToString();
            }
            else
            {
				return f.ToString("000000000000");
            }
		}
	}
}