from itertools import accumulate
from sys import stdin

def main():
    N = int(input())
    A = [int(input()) for _ in [0] * (N + 1)]
    B = [int(input()) for _ in [0] * (N + 1)]

    mod = 1000000007
    a = list(accumulate(A))
    a.reverse()
    ans = 0
    for a_, b_ in zip(a, B):
        ans += a_ * b_
    print(ans % mod)

input = lambda: stdin.readline()
main()