using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;

class Program
{
    static void Main()
    {
        new Magatro().Solve();
    }
}

class Magatro
{
    private int N;
    private const int Mod = (int)1e9 + 7;

    public void Solve()
    {
        N = int.Parse(Console.ReadLine());
        var dp = new long[N + 10, 4];
        dp[0, 0] = 1;
        for (int i = 0; i < N; i++)
        {
            if (i == 0)
            {
                dp[i + 1, 1] = dp[i, 0];
                dp[i + 2, 2] = dp[i, 0];
                dp[i + 3, 3] = dp[i, 0];
            }
            else
            {
                if (dp[i, 1] != 0)
                {
                    dp[i + 2, 2] += dp[i, 1];
                    dp[i + 3, 3] += dp[i, 1];
                }
                if (dp[i, 2] != 0)
                {
                    dp[i + 3, 3] += dp[i, 2];
                    dp[i + 1, 1] += dp[i, 2];
                }
                if (dp[i, 3] != 0)
                {
                    dp[i + 1, 1] += dp[i, 3];
                    dp[i + 2, 2] += dp[i, 3];
                }
            }
            dp[i + 1, 1] %= Mod;
            dp[i + 2, 2] %= Mod;
            dp[i + 3, 3] %= Mod;
        }
        Console.WriteLine((dp[N, 1] + dp[N, 2] + dp[N, 3]) % Mod);
    }
}