#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define REP(i, n) for(int i = 0; i < n; i++)
#define FOR(i, m, n) for(int i = m; i < n; i++)
const ll MOD = 1e9 + 7;

ll dp[1000001][3];

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

    REP(i, n) REP(j, 3) dp[i][j] = 0;
    dp[1][1] = 1;// K
    FOR(i, 1, n) {
        REP(j, 3) {
            if (j == 0) {
                (dp[i + 1][1] += dp[i][0]) %= MOD;// P->K
            } else if (j == 1) {
                (dp[i + 1][0] += dp[i][1]) %= MOD;// K->P
                (dp[i + 1][2] += dp[i][1]) %= MOD;// K->KK
            } else if (j == 2) {
                (dp[i + 1][0] += dp[i][2]) %= MOD;// KK->P
            }
        }

    }

    ll ans = 0;
    REP(j, 3) (ans += dp[n][j]) %= MOD;
    cout << ans << endl;
    return 0;
}