#include "bits/stdc++.h"
using namespace std;

typedef long long ll;
ll pr = (ll)1e9+7;

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

	vector<ll> dp(N+1), k(N+1), p(N+1);
	dp[1]=1, k[1]=1, p[1]=0;

	for (int i = 1; i < N; i++) {
		dp[i+1] = dp[i] + k[i];	dp[i+1] %= pr;
		k[i+1] = p[i];	k[i+1] %= pr;
		p[i + 1] = dp[i] - p[i];	p[i+1] %= pr;
	}

	cout << dp[N] << endl;

}