#include <bits/stdc++.h>

using namespace std;
#define rep(i, n, o) for(int i = o;i < (n);i++)
#define ou(x) cout << x << endl
#define ll long long
#define re return 0
signed main(){
    ll n;
    ll t = 1000000007;
    cin >> n;
    ll ans =  (n * (n  + 1) / 3) % t;
    ou(ans);
    re;
}