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

#define MOD 1000000007

#define int long long

int pow_mod(int n, int m){
    int ans = 1;
    while(m != 0){
        if(m & 1) ans = ans * n % MOD;
        n = n * n % MOD;
        m >>= 1;
    }
    return ans;
}

int combi(int n, int r){
    int a1, a2;
    n %= MOD;
    a1 = a2 = 1;
    for(int i = 0;i < r;i++){
        a1 = (a1 * (n-i)) % MOD;
        a2 = (a2 * (r-i)) % MOD;
    }

    return a1 * pow_mod(a2, MOD-2) % MOD;
}

signed main(){
    int n;
    cin >> n;
    int ans = combi(n-4+2, 2);

    int a2, a3;
    a3 = (n-4) % 3 == 0 ? 1 : 0;

    a2 = ((n-4) / 2) % MOD * 3;
    a2 %= MOD;

    //if((n-4) % 6 == 0 && n != 4) a2--;

    ans -= a2 + a3;
    if(ans < 0) ans = MOD-ans;

    ans *= pow_mod(3*2, MOD-2);
    ans %= MOD;

    ans += ((n-4) / 2) % MOD;
    ans += 1;

    ans %= MOD;

    cout << ans << endl;
    return 0;
}