Catalan Number

using System;
using System.Numerics;

class CatalanNumbers
{
    static void Main()
    {
        Console.WriteLine("This program prints the Nth Catalan number.");
        Console.WriteLine("The index of the Catlan numbers starts from 0.\n");

        Console.Write("Please insert value for N: ");
        string consoleInput;
        consoleInput = Console.ReadLine();


        uint catalanNumber;

        if (uint.TryParse(consoleInput, out catalanNumber) && catalanNumber >= 0)
        {
            BigInteger resultNumber = 1;
            BigInteger divisor = 1;

            for (uint i = 1; i <= 2 * catalanNumber; i++)
            {
                if (i <= catalanNumber + 1)
                {
                    divisor *= i;
                }
                if (i >= catalanNumber + 1)
                {
                    resultNumber *= i;
                }
            }
            resultNumber /= divisor;
            Console.WriteLine("The {0} Catalan number is {1}.", catalanNumber, resultNumber);
        }
        else
        {
            Console.WriteLine("Wrong input, N must be >=0!");
        }
    }
}