[C#-1.6.7] MoreFactorials

/*Write a program that calculates N!*K! / (K-N)! for given N and K (1<N<K).
*/

using System;


class MoreFactorials
{
    static void Main()
    {
        Console.WriteLine("Enter two numbers k>n>1: ");
        int n = int.Parse(Console.ReadLine());
        int k = int.Parse(Console.ReadLine());
        int result = 1;

        if ((n>1) && (k>n))
        {
            for (int i = k, j = 1; i > k - n; i--, j++)
        {
                result *= i*j;
        }
            Console.WriteLine(result);
        }
        else
        {
            Console.WriteLine("Invalid numbers");
        }
    }
}