def invmod(a,mod):#mod逆元
    if a == 0:
        return 0
    if a == 1:
        return 1
    return (-invmod(mod % a, mod) * (mod // a)) % mod
N = int(input())
lsA = list(map(int,input().split()))
mod = 10**9+7
ans = 0
n1Ck = [1]
for i in range(1,N):
    n1Ck.append((n1Ck[-1]*(N-i)*invmod(i,mod))%mod)
for i in range(N):
    ans += n1Ck[i]*lsA[i]
    ans %= mod
print(ans)