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

tmp = sum(b)
ans = 0
for j, i in enumerate(a):
  ans += i * tmp
  tmp -= b.pop()

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