#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)(s); i < (int)(e); ++i)
#define all(a) (a).begin(),(a).end()

#include <atcoder/modint>
using namespace atcoder;
using mint = modint1000000007;

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    
    int N;
    cin >> N;
    
    mint ans = 0;
    mint C = 1;
    rep(i, 0, N) {
        ll A;
        cin >> A;
        
        ans += A * C;
        C *= N - 1 - i;
        C /= i + 1;
    }
    
    cout << ans.val() << '\n';
}