#include <iostream>
#include <fstream>
#include <vector>
#include <cstring>
#include <string>
#include <algorithm>
#include <iomanip>
using namespace std;

typedef long long ll;
const ll MOD = ll(1e9 + 7);

ll dp[1000010][3];

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	int N;
	cin >> N;

	dp[0][0] = 1;
	for(int i = 0; i < N; i++) {
		dp[i + 1][0] += dp[i][1] + dp[i][2];
		dp[i + 1][1] += dp[i][0];
		dp[i + 1][2] += dp[i][1];
		for(int j = 0; j < 3; j++) {
			dp[i + 1][j] %= MOD;
		}
	}

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

}