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
    for bb in b:
        t = heapq.heappop(tmp)
        t[0] += bb // 2
        t[1] += 1
        heapq.heappush(tmp, t)
        mx = max(mx, t[1])
    c -= 1
    ans = min(ans, mx)
    b.rotate(1)
print(ans)