import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")
from heapq import heappop, heappush
import copy

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N = int(input())
	A = list(sorted(getlist()))
	B = getlist()
	# [レベル*10000+戦闘回数]
	Q = []
	for i in range(N):
		heappush(Q, A[i] * 10000)

	ans = INF
	for i in range(N):
		start = i
		Q2 = copy.copy(Q)
		for j in range(N):
			lvcnt = heappop(Q2)
			lvcnt += int((B[(start + j) % N]) // 2) * 10000 + 1
			heappush(Q2, lvcnt)

		# print(Q2)
		val = 0
		for j in range(N):
			val = max(val, Q2[j] % 10000)
		# print(val)

		ans = min(ans, val)

	print(ans)


if __name__ == '__main__':
	main()