n = int(input())
A = list(map(int, input().split()))
mod = 10 ** 9 + 7
N = n + 5
bikkuri = [0 for i in range(N)]
bikkuri[0] = 1
gyaku = [0 for i in range(N)]
gyaku[0] = 1
for i in range(1, N):
    bikkuri[i] = (i * bikkuri[i - 1]) % mod
    gyaku[i] = pow(bikkuri[i], mod - 2, mod)


def comb(n, r):
    if r < 0 or n - r < 0:
        return 0
    return (bikkuri[n] * gyaku[r] * gyaku[n - r]) % mod


temp = 0
for i in range(n):
    temp += comb(n - 1, i) * A[i]
    temp %= mod
print(temp)