Catalan Numbers

using System;
using System.Numerics;

class CatalanNumbers
{
    static void Main(string[] args)
    {
        int n = int.Parse(Console.ReadLine());
        BigInteger upperFactorial = 1;
        BigInteger lowerFactorial = 1;

        for (int i = n + 2; i <= n * 2; i++)
        {
            upperFactorial *= i;
        }
        for (int j = 1; j <= n; j++)
        {
            lowerFactorial *= j;
        }
        BigInteger catalan = upperFactorial / lowerFactorial;
        Console.WriteLine(catalan);
    }
}