import itertools


def main():
    n = int(input())
    lst1 = [int(input()) for _ in range(n + 1)]
    lst2 = [int(input()) for _ in range(n + 1)]
    mod = 10 ** 9 + 7

    acc = list(itertools.accumulate(lst2, func=lambda x, y: (x + y) % mod))
    acc.reverse()
    ans = 0
    for i in range(n + 1):
        ans += lst1[i] * acc[i] % mod
        ans %= mod
    print(ans)


if __name__ == "__main__":
    main()