N = int(input())

ans = 0

A = list(map(int, input().split()))

mod = 10 ** 9 + 7

x = 1

for i in range(N - 1, -1, -1):
    
    ans += A[i] * x
    ans %= mod
    x *= i
    x *= pow(N - i, mod - 2, mod)
    x %= mod
    
    
print(ans)