#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 <random>
#include<map>
#include <iomanip>
#include <time.h>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
using namespace std;
#define eps 0.000000001
#define LONG_INF 10000000000000000
#define GOLD 1.61803398874989484820458
#define MAX_MOD 1000000007
#define REP(i,n) for(long long i = 0;i < n;++i)
long long dp[2000000][4] = {};
int main() {
	long long n;
	cin >> n;
	dp[0][0] = 1;
	for (int i = 0;i < n;++i) {
		for (int q = 1;q <= 3;++q) {
			for (int j = 0;j <= 3;++j) {
				if (q != j) {
					dp[i + q][q] += dp[i][j];
					dp[i + q][q] %= MAX_MOD;
				}
			}
		}
	}
	long long ans = 0;
	for (int i = 1;i <= 3;++i) {
		ans += dp[n][i];
		ans %= MAX_MOD;
	}
	cout << ans << endl;
	return 0;
}