import sys
input = sys.stdin.readline

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

E=[[] for i in range(10**6+2)]

for i in range(N):
    E[A[i]].append(A[i]+B[i])

USE=[0]*(10**6+2)

Q=[1]
USE[1]=1

while Q:
    x=Q.pop()

    for to in E[x]:
        if USE[to]==0:
            USE[to]=1
            Q.append(to)

ANS=0

for i in range(10**6+2):
    if USE[i]==1:
        ANS=i

print(ANS)