M = 1000000007

n = int(input())
acc_a = []
acc = 0
for _ in range(n + 1):
    acc += int(input())
    acc_a.append(acc)
b = [int(input()) for _ in range(n + 1)]

ans = sum([acc_a[n - i] * b[i] % M for i in range(n + 1)]) % M

print(ans)