#include <bits/stdc++.h>
#define MOD 1000000007
typedef long long ll;
using namespace std;

ll N;
ll dp[1000001][3][2] = {{{0}}};

ll rec(ll count = 0, ll ken = 0, ll pa = 1){
    
    if(count == N) return 1;
    
    ll &res = dp[count][ken][pa];
    if(res != 0) return res;
    
    if(ken < 2) res += rec(count + 1, ken + 1, 0);
    res %= MOD;
    if(pa < 1) res += rec(count + 1, 0, pa + 1);
    res %= MOD;
    
    return res % MOD;
}

int main(void){
    
    cin >> N;
    
    cout << rec() << endl;
    
    return 0;
}