from fractions import Fraction

MOD = 10 ** 9 + 7

N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
a = []
b = []
for i in range(N):
    if A[i] == 0:
        continue
    a.append(A[i])
    b.append(B[i])
    if A[i] < 0:
        A[i] = -A[i]
        B[i] = -B[i]

A = a
B = b
N = len(A)

X = [Fraction(b, a) for a, b in zip(A, B)]

idx = list(range(N))
idx.sort(key=lambda i: X[i])

la = 0
ra = sum(A)
lb = 0
rb = sum(B)

y = -ra * X[0] + rb
x = X[0]

for i in idx:
    a = A[i]
    b = B[i]
    cx = X[i]
    la += a
    ra -= a
    lb += b
    rb -= b
    cy = (la - ra) * cx - (lb - rb)
    if cy < y:
        y = cy
        x = cx

print(x.numerator * pow(x.denominator, -1, MOD) % MOD)