import sys
input = sys.stdin.readline

from collections import Counter

mod=10**9+7

N=int(input())
A=list(map(int,input().split()))
B=list(map(int,input().split()))

LIST=[]
SUM=0

for i in range(N):
    a,b=A[i],B[i]

    if a==0:
        continue
    if a<0:
        a=-a
        b=-b

    LIST.append((a,b,a))
    SUM+=a

LIST.sort(key=lambda x:x[1]/x[0])

S=0
for i in range(len(LIST)):
    a,b,c=LIST[i]
    S+=c

    if S*2>=SUM:
        ANS=[a,b]
        break

LANS=ANS[1]*pow(ANS[0],mod-2,mod)%mod

print(LANS)