from collections import *
from itertools import *
from functools import *
from heapq import *
import sys,math
input = sys.stdin.readline


N = int(input())
A = list(map(int,input().split()))
B = list(map(int,input().split()))
B += B
Y = [(b,0) for b in A]
heapify(Y)
ans = N
for i in range(N):
    
    h = Y[:]
    tans = 0
    for j in range(N):
        
        a = B[i+j]
        x,c = heappop(h)
        x += a//2
        c += 1
        tans = max(tans,c)
        heappush(h,(x,c))
    ans = min(ans,tans)
print(ans)