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

typedef long long int ll;
ll MOD = 1000000007;
ll INFL = 1ll << 60;
ll INF = 1 << 30;

const long long MAX = 510000;
long long fac[MAX], finv[MAX], inv[MAX];

// テーブルを作る前処理、先にやっておく
void nCr_init() {
  fac[0] = fac[1] = 1;
  finv[0] = finv[1] = 1;
  inv[1] = 1;
  for (int i = 2; i < MAX; i++) {
    fac[i] = fac[i - 1] * i % MOD;
    inv[i] = MOD - inv[MOD % i] * (MOD / i) % MOD;
    finv[i] = finv[i - 1] * inv[i] % MOD;
  }
}

// nCrを計算する
long long nCr(int n, int r) {
  if (n < r) return 0;
  if (n < 0 || r < 0) return 0;
  return fac[n] * (finv[r] * finv[n - r] % MOD) % MOD;
}

int main() {
  int n;
  cin >> n;

  nCr_init();

  ll a, ans = 0;
  for (int i = 0; i < n; i++) {
    cin >> a;
    ans = (ans + a * nCr(n - 1, i) % MOD) % MOD;
  }

  cout << ans << endl;
}