using System;
using System.Numerics;

class CatalanNumbers
{
    static void Main()
    {
        int n = 5;
        int DoubleN = n * 2;
        int nPlus1 = n + 1;
        BigInteger factorielN = 1;
        BigInteger factDoubleN = 1;
        BigInteger factNPlus1 = 1;
        BigInteger result = 1;
        for (int i = 1; i <= DoubleN; i++)
        {
            factDoubleN *= i;
            if (nPlus1 >= i)
            {
                factNPlus1 *= i;
                if (n >= i)
                {
                    factorielN *= i;
                }
                else
                {
                    continue;
                }
            }
            else
            {
                continue;
            }
        }
        result = factDoubleN / ((factNPlus1) * factorielN);
        Console.WriteLine(result);
    }
}