# 754 畳み込みの和

n = int(input())
a = [int(input()) for _ in range(n + 1)]
b = [int(input()) for _ in range(n + 1)]
bb = [0] * (len(b) + 1)
for i in range(n + 1):
    bb[i + 1] = bb[i] + b[i]

mod = int(1e9 + 7)
ans = 0

for i in range(n + 1):
    ans += a[i] * bb[n - i + 1]
    ans %= mod
ans %= mod

print(ans)