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
    if A[i] < 0:
        A[i] = -A[i]
        B[i] = -B[i]
    a.append(A[i])
    b.append(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 = sum(A)
ra = 0
lb = sum(B)
rb = 0

y = -(la * X[0] - lb)
x = X[0]

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

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