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

#define mod 1000000007
#define MAX_N 200010
long long inv[MAX_N];
long long factorial[MAX_N];
long long inv_factorial[MAX_N];

void GetInv(){
    for (int i = 1; i < MAX_N; i++) {
        if (i == 1) inv[i] = 1;
        else {
            inv[i] = (mod - (mod / i) * inv[mod % i]) % mod;
            if (inv[i] < 0) inv[i] += mod;
        }
    }
}
void GetFactorial(){
    factorial[0] = 1; inv_factorial[0] = 1;
    for (int i = 1; i < MAX_N; i++) {
        factorial[i] = factorial[i-1] * i;
        factorial[i] %= mod;
        inv_factorial[i] = inv_factorial[i-1] * inv[i];
        inv_factorial[i] %= mod;
    }
}

long long combination(int n, int r) {
    long long ret = factorial[n] * inv_factorial[r];
    ret %= mod;
    ret *= inv_factorial[n-r];
    return ret % mod;
}

int main() {
    GetInv(); GetFactorial();
    int n; cin >> n;
    long long ans = 0;
    for (int i = 0; i < n; i++) {
        long long c; cin >> c;
        ans = (ans + combination(n-1, i) * c % mod) % mod;
    }
    cout << ans << endl;
    return 0;
}