n = int(input().strip())
a = [int(input().strip()) for _ in range(n + 1)]
b = [int(input().strip()) for _ in range(n + 1)]

ans = 0
for i in range(n + 1):
  tmp = sum([b[j] for j in range(n + 1 - i)])
  ans += (a[i] * tmp) % (10**9 + 7)

print(ans % (10**9 + 7))