import sys
input=lambda: sys.stdin.readline().rstrip()
n=int(input())
A=[int(i)*(10**4) for i in input().split()]
B=[int(i)//2 for i in input().split()]
import heapq
import copy
ans=n
for i in range(n):
  Q=copy.deepcopy(A)
  heapq.heapify(Q)
  for j in range(n):
    ind=i+j
    if ind>=n:
      ind%=n
    heapq.heappush(Q,heapq.heappop(Q)+B[ind]*(10**4)+1)

  ans=min(ans,max(q%10**4 for q in Q))
print(ans)