#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll dp[1000001][3];

int main() {
	int n;
	cin >> n;
	dp[0][0] = 1;
	dp[0][1] = 0;
	dp[0][2] = 0;
	dp[1][0] = 1;
	dp[1][1] = 0;
	dp[1][2] = 0;
	dp[2][0] = dp[1][1] + dp[1][2];
	dp[2][1] = dp[0][0] + dp[0][2];
	dp[2][2] = 0;
	for (int i = 3;i <= n;i++) {
		dp[i][0] = dp[i - 1][1] + dp[i - 1][2];
		dp[i][1] = dp[i - 2][0] + dp[i - 2][2];
		dp[i][2] = dp[i - 3][0] + dp[i - 3][1];
		dp[i][0] %= 1000000007;
		dp[i][1] %= 1000000007;
		dp[i][2] %= 1000000007;
	}
	cout << (dp[n][0] + dp[n][1] + dp[n][2])%1000000007 << endl;

	return 0;
}