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

class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        long ans = this.GetAns(BeforeType.Other, int.Parse(Reader.ReadLine()));
        Console.WriteLine(ans);


    }
    
    Dictionary<int, Dictionary<BeforeType, long>> dic = new Dictionary<int, Dictionary<BeforeType, long>>();
    private long GetAns(BeforeType before, int remain) {
        if(!dic.ContainsKey(remain)) {
            dic.Add(remain, new Dictionary<BeforeType, long>());
        }
        if(dic[remain].ContainsKey(before)) {
            return dic[remain][before];
        }
        
        if(remain == 1) {
            if(before == BeforeType.KenKen) {
                return 1;
            }
            if(before == BeforeType.Pa) {
                return 1;
            }
            return 2;
        }
        
        long ans = 0;
        if( before == BeforeType.Ken) {
            ans += this.GetAns(BeforeType.KenKen, remain - 1);
        }
        if(before == BeforeType.Ken || before == BeforeType.KenKen) {
            ans += this.GetAns(BeforeType.Pa, remain - 1);
        }
        if(before != BeforeType.Ken && before != BeforeType.KenKen) {
            ans += this.GetAns(BeforeType.Ken, remain - 1);
        }
        ans = ans % this.ModNum;
        dic[remain].Add(before, ans);
        return ans;
        
    }
    private long ModNum = 1000000000 + 7;
    
    public enum BeforeType {
        Ken,
        KenKen,
        Pa,
        Other
    }
    


    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"




100

 
";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}