#include "bits/stdc++.h"

using namespace std;

#define pb push_back
#define mp make_pair
constexpr int INF = 1 << 29;
constexpr int MOD = 1000000007;
typedef long long ll;
typedef unsigned long long ull;

constexpr int dx[4] = {1, 0, -1, 0};
constexpr int dy[4] = {0, 1, 0, -1};

int main() {
    int N;
    cin >> N;
    vector<vector<int>> dp(4, vector<int>(N + 1));
    dp[0][0] = 1;

    for (int j = 1; j <= N; j++) {
        for (int k = 1; k < 4; k++) {
            for(int i = 0; i < 4; i++) {
                if (i == k) continue;
                if (j - k >= 0) {
                    dp[k][j] += dp[i][j - k];
                    dp[k][j] %= MOD;
                }
            }
        }
    }
    int sum = 0;
    for (int i = 0; i < 4; i++) {
        sum += dp[i][N];
        sum %= MOD;
    }
    cout << sum << endl;


    return 0;
}