using System;
using System.Numerics;

namespace SequenceInMatrix
{
    class Program
    {
        static void Main(string[] args)
        {
            BigInteger N = BigInteger.Parse(Console.ReadLine());
            BigInteger sum = 0;

            for (int row = 0; row < N; row++)
            {
                for (int col = row; col< N; col++)
                {
                    if (col >= row)
                    {
                        sum += BigInteger.Pow(2, row + col);
                    }
                }
            }
            Console.WriteLine(sum);
        }
    }
}