from fractions import Fraction
import sys
input = sys.stdin.readline
MOD = 10**9+7
N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
M = []
for i in range(N):
    if A[i]==0:
        continue
    M.append(Fraction(B[i], A[i]))
M.sort()
tmp = M[len(M)//2]
ans = tmp.numerator * pow(tmp.denominator, MOD-2, MOD) % MOD
print(ans)