#include <iostream>
#define REP(i, n) for(int i = 0; i < (int)(n); i++)
#define print(x) cout << x << endl;
using namespace std;

const int MAX = 100001;
const int MOD = 1000000007;
long long fac[MAX], finv[MAX], inv[MAX];

void COMinit() {
    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;
    }
}

long long COM(int n, int k){
    if (n < k) return 0;
    if (n < 0 || k < 0) return 0;
    return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;
}

int main(void){
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N;
    cin >> N;
    
    COMinit();
    int a;
    
    int sum = 0;
    REP(i, N){
        cin >> a;
        sum += a*COM(N-1,i) % MOD;
        sum %= MOD;
    }
    
    print(sum);
    return 0;
}