import numpy as np


def linelist(T=int):
    return [T(x) for x in input().split()]


def read(T=int):
    return T(input())



modp = 10 ** 9 + 7

n = read()
a = np.zeros(n + 1, dtype=np.longlong)
b = np.zeros(n + 1, dtype=np.longlong)
for i in range(n + 1):
    a[i] = read()
for i in range(n + 1):
    b[i] = read()

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