#include <iostream>

using namespace std;
using LL = long long;
using ULL = unsigned long long;

constexpr int MOD = 1'000'000'007;

int dp[1000001][4];

int main() {
    int N;
    cin >> N;

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

    cout << ((dp[N][1] + dp[N][2]) % MOD + dp[N][3]) % MOD << endl;
}