from itertools import accumulate
m = 10**9 + 7
n = int(input())
a = [int(input()) for _ in range(n + 1)]
b = [int(input()) for _ in range(n + 1)]
sb = list(accumulate([0] + b))

ans = 0
for i in range(n + 1):
    ans = (ans + a[i] * sb[n-i+1] % m) % m
print(ans)