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

a = []

for i in (input().split()):
    heapq.heappush(a,((int(i) << 24) + 0))
b = deque(list(map(int, input().split())))
c = n
ans = 0xFFFFFFFF

mxlist = [0] * n
while (c):
    tmp = list(a)
    mx = 0
    index = 0
    for bb in b:
        t = heapq.heappop(tmp)
        am = t & 0xFFFFFF
        bm = t >> 24
        bm += bb >> 1
        am += 1
        mxlist[index] = am
        if am >= ans:
            break
        index += 1
        heapq.heappush(tmp, (bm << 24) + am)
    c -= 1
    ans = min(ans, max(mxlist))
    b.rotate(1)
print(ans)