using System;
using System.Numerics;

namespace _08._CatalanNumbers
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            BigInteger result = 1;
            BigInteger numerator = 1;
            BigInteger divider = 1;

            if (n < 0 || n > 100)
            {
                Console.WriteLine("Invalid number!");
            }
            else
            {

                for (int k = 2; k <= n; k++)
                {
                    numerator *= n + k;
                    divider *= k;

                }
                result = numerator / divider;
                Console.WriteLine(result);
            }

        }
    }
}