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

class TEST{
	static void Main(){
		Sol mySol =new Sol();
		mySol.Solve();
	}
}

class Sol{
	public void Solve(){
		
		int[][] dp=new int[3][];
		for(int i=0;i<3;i++){
			dp[i]=new int[N+1];
		}
		
		int mod=(int)1e9+7;
		
		int pa=0;
		int ken1=1;
		int ken2=2;
		
		dp[pa][0]=1;
		for(int i=0;i<N;i++){
			dp[ken2][i+1]+=dp[ken1][i];if(dp[ken2][i+1]>=mod)dp[ken2][i+1]-=mod;
			dp[pa][i+1]+=dp[ken1][i];if(dp[pa][i+1]>=mod)dp[pa][i+1]-=mod;
			dp[pa][i+1]+=dp[ken2][i];if(dp[pa][i+1]>=mod)dp[pa][i+1]-=mod;
			dp[ken1][i+1]+=dp[pa][i];if(dp[ken1][i+1]>=mod)dp[ken1][i+1]-=mod;
		}
		
		int ans=dp[pa][N];
		ans+=dp[ken1][N];if(ans>=mod)ans-=mod;
		ans+=dp[ken2][N];if(ans>=mod)ans-=mod;
		Console.WriteLine(ans);
	}
	int N;
	public Sol(){
		N=ri();
	}




	static String rs(){return Console.ReadLine();}
	static int ri(){return int.Parse(Console.ReadLine());}
	static long rl(){return long.Parse(Console.ReadLine());}
	static double rd(){return double.Parse(Console.ReadLine());}
	static String[] rsa(){return Console.ReadLine().Split(' ');}
	static int[] ria(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>int.Parse(e));}
	static long[] rla(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>long.Parse(e));}
	static double[] rda(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>double.Parse(e));}
}