Exercise10Catalan

using System;
using System.Numerics;

class Exercise10Catalan
{
    static BigInteger Factorial(int factor)
    {
        if (factor > 1)
        {
            return factor * Factorial(--factor);
        }
        return 1;
    }
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        Console.WriteLine(Factorial(2*n) / (Factorial(n+1) * Factorial(n)));
    }
}