n = int(input())
A = [int(input()) for _ in range(n+1)]
B = [int(input()) for _ in range(n+1)]

mod = 10**9+7

from itertools import accumulate
CA = list(accumulate(A))

ans = 0
for i, b in enumerate(B):
    ans += b*CA[n-i]%mod
    ans %= mod
print(ans%mod)