import heapq
from collections import deque
from copy import deepcopy
d = deque()
n = int(input())

a = []

for i in (input().split()):
    heapq.heappush(a,[int(i),0])
b = deque(list(map(int, input().split())))
c = n
ans = 0xFFFFFFFF

while (c):
    tmp = deepcopy(a)
    mx = 0
    mn = 0xFFFFFFFF
    count = 0
    for bi in range(len(b)):
        t = heapq.heappop(tmp)
        t[0] += b[(c+bi)%n] >> 1
        t[1] += 1
        mx = max(mx, t[1])
        if mx >= ans:
           break
        heapq.heappush(tmp, t)
    c -= 1
    ans = min(ans, mx)
print(ans)