using System;

public class Hello
{
    public static void Main()
    {
        var n = long.Parse(Console.ReadLine().Trim());
        if (n >= 50) Console.WriteLine(new string('0', 12));
        else Console.WriteLine(getAns((int)n));
    }
    public static long getAns(int n)
    {
        var ans = 1L;
        for (int i = 2; i <= n; i++)
        {
            ans *= i;
            var t = ans.ToString();
            if (t.Length >= 13) ans = long.Parse(t.Substring(t.Length - 12));
        }
        return ans;
    }
}