#include<iostream>
#include<vector>
#include<algorithm>
#include<iomanip>
using namespace std;
#define OVERLOAD_REP(_1, _2, _3, name, ...) name
#define REP1(i, n) for (auto i = std::decay_t<decltype(n)>{}; (i) != (n); ++(i))
#define REP2(i, l, r) for (auto i = (l); (i) != (r); ++(i))
#define rep(...) OVERLOAD_REP(__VA_ARGS__, REP2, REP1)(__VA_ARGS__)
#define REP(i, l, r) rep(i, l, r+1)
#define all(x) (x).begin(),(x).end()
#define inf 1000000000
using ll = long long;
using P = pair<int,int>;
using Graph = vector<vector<int> >;

int main() {
    // 高速化
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    // 小数点の出力桁数を指定
    cout << fixed << setprecision(10);

    // メイン
    const ll mod = 1000000007;
    int N;
    cin >> N;
    vector<ll> dp(N + 5, 0);
    dp[0] = 1;
    for(int i = 0; i < N; i++) {
        dp[i] %= mod;
        dp[i + 2] += dp[i];
        dp[i + 3] += dp[i];
        if(N - i <= 2) dp[N] += dp[i];
    }
    cout << dp[N] % mod << endl;

    return 0;
}