# coding: utf-8
import heapq
N = int(input())
A = list(map(int, input().split()))
B = [int(x)/2 for x in input().split()] * 2
A.sort()
Aheap = [(a, 0) for a in A]

ans = N
for i in range(N):
	a = Aheap[:]
	for j in range(N):
		lv, c = a[0]
		heapq.heapreplace(a, (lv+B[i+j], c+1))
	ans=min(ans, max(c for lv, c in a))

print(ans)