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

typedef long long ll;
#define FOR(i,a,b) for(int (i)=(a);i<(int)(b);i++)
#define rep(i,n) FOR(i,0,n)
#define mset(a,x) memset(a,x,sizeof(a))

const int mod = (int)1e9 + 7;
int N;

ll dp[1000005][3][2];
ll rec(int i, int ken, int pre) {
    ll &r = dp[i][ken][pre];
    if (r != -1) return r;
    if (ken > 2) return r = 0;
    if (i >= N) return r = 1;
    if (pre == 0)
        r = (rec(i + 1, ken + 1, 0) % mod + rec(i + 1, 0, 1) % mod) % mod;
    else
        r = rec(i + 1, ken + 1, 0) % mod;
    return r;
}

int main() {
    cin >> N;
    mset(dp, -1);
    cout << rec(0, 0, 1) << endl;
    return 0;
}