from heapq import heapify, heappop, heappush
from tkinter import W

n = int(input())
a = list(map(int, input().split()))
b = list(map(int, input().split()))

ans = []
for start in range(n):
    q = []
    heapify(q)
    for i in range(n):
        heappush(q, (a[i], 0))
    
    for i in range(n):
        p, num = heappop(q)
        p += b[(start + i) % n] // 2
        heappush(q, (p, num + 1))
    
    ma = 0
    for i in range(n):
        ma = max(ma, heappop(q)[1])
    
    ans.append(ma)

print(max(ans))