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) << 4) + 0))
b = deque(list(map(int, input().split())))
c = n
ans = 0xFFFFFFFF

while (c):
    tmp = deepcopy(a)
    mx = 0
    mn = 0xFFFFFFFF
    count = 0
    for bb in b:
        t = heapq.heappop(tmp)
        am = t & 0x0F
        bm = t >> 4
        bm += bb >> 1
        am += 1
        mx = max(mx, am)
        if mx >= ans:
            break
        heapq.heappush(tmp, (bm << 4) + am)
    c -= 1
    ans = min(ans, mx)
    b.rotate(1)
print(ans)