#include <bits/stdc++.h>

#define REP(i, n) for (int i = 0; i < n; i++)
#define ALL(obj) obj.begin(), obj.end()

const int iINF = 1e9;
const long long llINF = 1e18;
const int MOD = 1e9 + 7;

using namespace std;

const int MAX = 100000;

vector<long long> fac(MAX + 1), inverseFac(MAX + 1);

long long modPow(long long x, long long n) {
    long long ans = 1;
    while (n != 0) {
        if (n & 1) ans = ans * x % MOD;
        x = x * x % MOD;
        n = n >> 1;
    }
    return ans;
}

long long comb(long long a, long long b) {
    if (a == 0 && b == 0) return 1;
    if (a < b || a < 0) return 0;
    long long tmp = inverseFac[a - b] * inverseFac[b] % MOD;
    return tmp * fac[a] % MOD;
}

long long perm(long long a, long long b) {
    if (a < b) return 0;
    long long tmp = inverseFac[a - b] % MOD;
    return tmp * fac[a] % MOD;
}

long long dupc(long long a, long long b) {
    if (a == 0 && b == 0) return 1;
    if (a < 0 || b == 0) return 0;
    long long tmp = inverseFac[a - 1] * inverseFac[b] % MOD;
    return tmp * fac[a + b - 1] % MOD;
}

void init() {
    fac[0] = 1;
    inverseFac[0] = 1;
    for (long long i = 0; i < MAX; i++) {
        fac[i + 1] = fac[i] * (i + 1) % MOD;
        inverseFac[i + 1] = inverseFac[i] * modPow(i + 1, MOD - 2) % MOD;
    }
}

int main() {
    int N;
    cin >> N;
    vector<long long> a(N);
    REP(i, N) {
        cin >> a[i];
    }

    init();
    long long ans = 0;
    REP(i, N) {
        ans += comb(N - 1, i) * a[i];
        ans %= MOD;
    }

    cout << ans << endl;
}