using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter k =");

        int k = int.Parse(Console.ReadLine());

        Console.WriteLine("Enter n =");

        int n = int.Parse(Console.ReadLine());

        int t = 1;

        for (int i =0; i <=k ;i++) 

        {

            t *= n -i*k;

        }

        Console.WriteLine("t =" + t);

    }

}