import sys
input = sys.stdin.readline
from heapq import *

n = int(input())
ans = 1 << 30
p = [l * 2000 for l in map(int, input().split())]
heapify(p)
enemies = list(map(int, input().split()))
for s in range(n):
	party = p[:]
	for i in range(n):
		x = heappop(party)
		heappush(party, (x // 2000 + enemies[(s + i) % n] // 2) * 2000 + x % 2000 + 1)
	ans = min(ans, max(x % 2000 for x in party))
print(ans)