#include <vector>
#include <algorithm>
#include <iostream>
using namespace std;

#define M 1000000007

long long fact[100002], facti[100002];

int modinv(int a, int m) {
    int x = m, y = a, p = 1, q = 0, r = 0, s = 1;
    while (y != 0) {
        int u = x / y;
        int x0 = y; y = x - y * u; x = x0;
        int r0 = p - r * u, s0 = q - s * u;
        p = r; r = r0; q = s; s = s0;
    }
    return q < 0 ? q + m : q;
}

long long mod_ch(int n, int k, int m) {
    if (n < 0 || k < 0 || k > n) return 0;
    return fact[n] * facti[k] % m * facti[n-k] % m;
}

int main () {
    fact[0] = 1; facti[0] = 1;
    for (int i = 1; i <= 100000; i++) {
        fact[i] = (fact[i-1] * i) % M;
        facti[i] = modinv(fact[i], M);
    }

    int n; cin >> n;
    int a[n]; for (int i = 0; i < n; i++) cin >> a[i];
    long long ans = 0;
    for (int i = 0; i < n; i++) ans += mod_ch(n-1, i, M) * a[i] % M;
    cout << ans % M << endl;
}