using System;

public class Program

{

    public static void Main()

    {

        int product = 1;

        for (int i = 20; i > 1; i--)

        {

            if (!ShouldIgnore(i))

                product *=i;

        }

        Console.WriteLine(product);

    }

    static private bool ShouldIgnore(int input)

    {

        for (int i = 20; i > 1; i--)

        {

            if ((input != i ) && (i%input==0))

                return true;

        }

        return false;

    }

}