using System;

public class Hello
{
    public static void Main()
    {
        var n = long.Parse(Console.ReadLine().Trim());
        Console.WriteLine(getAns((int)n));

    }
    public static string getAns(int n)
    {
        if (n == 1) return "1";
        if (n >= 50) return new string('0', 12);
        var ansnum = 1L; var t = "";
        for (int i = 2; i <= n; i++)
        {
            ansnum *= i;
            t = ansnum.ToString();
            if (t.Length >= 13)
            {
                t = t.Substring(t.Length - 12);
                ansnum = long.Parse(t);
            }
        }
        return t;
    }
}