MOD = 10**9+7
from fractions import Fraction
N = int(input())
A = list(map(int,input().split()))
B = list(map(int,input().split()))

C = []
for i in range(N):
    if(A[i] == 0):continue
    C.append(Fraction(B[i],A[i]))
C.sort()

mid = C[(len(C) - 1)//2]
a,b = mid.as_integer_ratio()
print(a * pow(b,-1,MOD) % MOD)