#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <cmath>

#define FORR(i,b,e) for(int i=(b);i<(int)(e);++i)
#define FOR(i,e) FORR(i,0,e)
#define ALL(c) begin(c), end(c)
#define sortuniq(v) sort(v.begin(), v.end()), v.erase(unique(v.begin(),v.end()),v.end())
#define dump(var) cerr << #var ": " << var << "\n"
#define dumpc(con) for(auto& e: con) cerr << e << " "; cerr<<"\n"

typedef long long ll;
typedef unsigned long long ull;

const double EPS = 1e-6;
const int d4[] = {0, -1, 0, 1, 0};

using namespace std;

const int MOD = 1000000007;

int p[1000010], k[1000010];

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    int N;
    cin >> N;
    k[0] = p[0] = 0;
    k[1] = 1; p[1] = 0;
    k[2] = 1; p[2] = 1;
    k[3] = 1; p[3] = 1;
    FORR(i, 4, N+1) {
        k[i] = (p[i-2] + p[i-1]) % MOD;
        p[i] = k[i-1];
    }

    cout << (k[N] + p[N]) % MOD << endl;

    return 0;
}