#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <string>
#include <queue>
#include <stack>
#include <math.h>
#include <set>
#define ALL(obj) (obj).begin(),(obj).end()
#define RALL(obj) (obj).rbegin(),(obj).rend()
#define P pair<int,int>

#define MOD 1000000007
#define INF 2147483647
#define NINF (-2147483647-1)
#define LLINF 9223372036854775807
using ll = long long;
using namespace std;

ll fnc[100010];
ll inv[100010];

ll powMod(ll k, ll n, ll mod) {
    ll x = 1;
    while (n > 0) {
        if (n & 1) {
            x = x * k % mod;
        }
        k = k * k % mod;
        n >>= 1;
    }
    return x;
}

int main() {
    int N;
    cin >> N;
    vector<ll> a(N);
    for (int i = 0; i < N; i++)
    {
        cin >> a[i];
    }
    ll ans = 0, comb = 1;
    for (int i = 0; i < N; i++)
    {
        ans = (ans + a[i] * comb) % MOD;
        comb = comb * (N - 1 - i) % MOD;
        comb = comb * powMod(i + 1, MOD - 2, MOD) % MOD;
    }
    cout << ans << endl;
    getchar(); getchar();
    return 0;
}