#include <bits/stdc++.h>

using namespace std;

#define rep(i, n) for(int i = 0; i < (int)n; ++i)
#define FOR(i, a, b) for(int i = a; i < (int)b; ++i)
#define rrep(i, n) for(int i = ((int)n - 1); i >= 0; --i)

typedef long long ll;
typedef long double ld;

const int Inf = 1e9;
const double EPS = 1e-9;
const ll MOD = 1e9 + 7;

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(0);
    int n;
    cin >> n;
    vector<vector<ll> > dp(n + 5, vector<ll>(4));
    dp[0][0] = 1;
    rep (i, n) {
        rep (j, 4) {
            if (dp[i][j] == 0) continue;
            FOR (k, 1, 4) {
                if (j == k) continue;
                if (i + k > n) continue;
                dp[i + k][k] += dp[i][j];
                dp[i + k][k] %= MOD;
            }
        }
    }
    ll res = 0;
    rep (i, 3) {
        res += dp[n][i + 1];
        res %= MOD;
    }
    cout << res << endl;
    
    return 0;
}