# import sys; input = sys.stdin.buffer.readline
# sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N = int(input())
	ans = 0
	A = []
	for i in range(N + 1):
		a = int(input())
		A.append(a)

	B = []
	for i in range(N + 1):
		b = int(input())
		B.append(b)

	Bs = [0]
	for i in range(N + 1):
		Bs.append(Bs[-1] + B[i])

	for i in range(N + 1):
		ans += A[i] * Bs[-1 - i]

	ans %= con
	print(ans)


if __name__ == '__main__':
	main()