#define _USE_MATH_DEFINES
#include <algorithm>
#include <cstdio>
#include <functional>
#include <iostream>
#include <cfloat>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <time.h>
#include <vector>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> i_i;
typedef pair<ll, int> ll_i;
typedef pair<double, int> d_i;
typedef pair<ll, ll> ll_ll;
typedef pair<double, double> d_d;
struct edge { int u, v; ll w; };

ll MOD = 1000000007;
ll _MOD = 1000000009;
double EPS = 1e-10;

int main() {
	int N; cin >> N;
	if (N == 1) {
		cout << 1 << endl;
		return 0;
	}
	vector<int> dp(N + 1);
	dp[0] = 1;
	for (int i = 0; i <= N; i++) {
		if (i + 2 <= N) dp[i + 2] = (dp[i + 2] + dp[i]) % MOD;
		if (i + 3 <= N) dp[i + 3] = (dp[i + 3] + dp[i]) % MOD;
	}
	int sum = 0;
	for (int i = N - 2; i <= N; i++)
		sum = (sum + dp[i]) % MOD;
	cout << sum << endl;
}