# coding:utf-8

import sys
# from collections import Counter, defaultdict

INF = float('inf')
MOD = 10 ** 9 + 7

def LI(): return [int(x) for x in sys.stdin.readline().split()]
def LI_(): return [int(x) - 1 for x in sys.stdin.readline().split()]
def LS(): return sys.stdin.readline().split()
def II(): return int(sys.stdin.readline())
def SI(): return input()


def main():
    n = II()
    A = LI()

    def cmb_mod(n, r):
        if n - r < r: return cmb_mod(n, n - r)

        ans_mul = 1
        ans_div = 1
        for i in range(r):
            ans_mul *= n - i
            ans_mul %= MOD
            ans_div *= i + 1
            ans_div %= MOD

        ans = ans_mul * pow(ans_div, MOD - 2, MOD) % MOD
        return ans

    res = 0
    for i in range(n):
        res += A[i] * cmb_mod(n - 1, i)
        res %= MOD

    return res


print(main())