using System;

namespace Veronichka_3
{
    class MainClass
    {
        public static void Main (string[] args)
        {
            long s=0, i, z = 1,b;
            for (i = 2; i <= 10; i += 2) {
                for (b = 1; b <= i; b++) {
                    z *= 3;
                }


                if (i % 4 == 0) {
                    s -= z;

                } else {
                    s += z;
                }
                z = 1;
            }
            Console.WriteLine (s);
            }

        }

    }