import heapq

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

H=[]
for a in A:
    H.append([a,0])

def calc(H,B):
    heapq.heapify(H)
    ANS=0

    for b in B:
        x,y=heapq.heappop(H)

        x+=b//2
        y+=1
        ANS=max(ANS,y)

        heapq.heappush(H,[x,y])

    return ANS

ANS=1<<60
for i in range(N):
    ANS=min(ANS,calc(H[:],B[i:]+B[:i]))

print(ANS)