Catalan Number

using System;
using System.Numerics;


class PrintMyName
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        
        BigInteger factoriel2N =1;
        BigInteger factorielN = 1;
        BigInteger factoriel = 1;
        BigInteger catalanNum;

        for (int i = 1; i <= n * 2; i++)
        {
            factoriel2N *= i;
            if (i <= n )
            {
                factorielN *= i;
            }
            if (i <= n +1)
            {
                factoriel *= i;
            }
        }


        catalanNum = factoriel2N / (factorielN * factoriel);
        Console.WriteLine(catalanNum);

        
    }

}