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


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


def ndarray(dims, v=0):
    if len(dims) == 1:
        return [v for _ in range(dims[0])]
    else:
        return [ndarray(dims[1:], v) for _ in range(dims[0])]

import numpy as np

modp = 10**9+7

n = read()
a = np.zeros(n+1)
b = np.zeros(n+1)
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)