def inv(x):
    return pow(x, MOD-2, MOD)

def C(n, r):
    return fact[n] * inv(fact[r]) * inv(fact[n-r])

N = int(input())
a = list(map(int, input().split()))
MOD = 10 ** 9 + 7

fact = [1]

for i in range(1, N+1):
    fact.append(fact[-1] * i % MOD)
    
ans = 0

for i in range(N):
    ans += C(N-1, i) * a[i]
    ans %= MOD

print(ans)