#include<iostream>
#include<algorithm>
#include<string>
#include<vector>

using namespace std;

const int mod = 1e9+7;
long long dp[1000010][3];

int main(){
	int N;
	cin >>N;
	for(int i=0; i < N; i++)
		for(int j = 0; j < 3; j++)
			dp[i][j] = 0;
	dp[1][1] = 1;




	for(int i = 1; i < N;i++){
		(dp[i + 1][1] += dp[i][0]) %= mod;

		(dp[i + 1][0] += dp[i][1]) %= mod;
		(dp[i + 1][2] += dp[i][1]) %= mod;

		(dp[i + 1][0] += dp[i][2]) %= mod;
	}

	long long ans =0;
	(ans +=dp[N][0]) %= mod;
	(ans +=dp[N][1]) %= mod;
	(ans +=dp[N][2]) %= mod;
	ans = ans%mod;
	cout << ans << endl;

	return 0;
}