#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream> 
#include<map>
#include <iomanip>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
using namespace std;
#define MAX_MOD 1000000007
#define REP(i,n) for(long long i = 0;i < n;++i)
#define LONG_INF 100000000000000
long long dp[2000000][4] = {};
int main() {
	long long n;
	cin >> n;
	dp[0][0] = 1;
	for (int i = 1;i <= n;++i) {
		for (int q = 0;q < 2;++q) {
			dp[i][q + 1] += dp[i - 1][q];
			dp[i][q + 1] %= MAX_MOD;
		}
		long long pow = 0;
		for (int q = 1;q <= 2;++q) {
			pow += dp[i - 1][q];
		}
		dp[i][0] += pow;
		dp[i][0] %= MAX_MOD;
	}
	long long ans = 0;
	for (int i = 0;i < 4;++i) {
		ans += dp[n][i];
	}
	cout << ans%MAX_MOD << endl;
	return 0;
}