using System;
using System.Collections.Generic;

class Program
{
    static string InputPattern = "InputX";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("1");
            //3
            //1以上10以下で、3の倍数および3の付く数は、3, 6, 9の3個です。
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("2");
            //45
            //1以上100以下で、3の倍数および3の付く数は、
            // 3, 6, 9,12,13,15,18,21,23,24,
            //27,30,31,32,33,34,35,36,37,38,
            //39,42,43,45,48,51,53,54,57,60,
            //63,66,69,72,73,75,78,81,83,84,
            //87,90,93,96,99の45個です。
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("19");
            //9099432188218005273
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();
        int P = int.Parse(InputList[0]);

        //場合の数[3を法とした余り,3の有無]なDP表
        long[,] PrevDP = new long[3, 2];
        PrevDP[0, 0] = 1;

        for (int I = 1; I <= P; I++) {
            long[,] CurrDP = new long[3, 2];
            for (int J = 0; J <= PrevDP.GetUpperBound(0); J++) {
                for (int K = 0; K <= PrevDP.GetUpperBound(1); K++) {
                    if (PrevDP[J, K] == 0) continue;

                    for (int NewNum = 0; NewNum <= 9; NewNum++) {
                        int NewJ = (J + NewNum) % 3;

                        int NewK = K;
                        if (NewNum == 3) NewK = 1;

                        CurrDP[NewJ, NewK] += PrevDP[J, K];
                    }
                }
            }
            PrevDP = CurrDP;
        }
        long Answer = 0;
        for (int I = 0; I <= PrevDP.GetUpperBound(0); I++) {
            for (int J = 0; J <= PrevDP.GetUpperBound(1); J++) {
                if (I == 0 || J == 1) Answer += PrevDP[I, J];
            }
        }
        Answer--; //0の分
        Console.WriteLine(Answer);
    }
}