import queue
N = int(input())
A = [int(x) for x in input().split()]
B = [int(x) for x in input().split()]

min_max_cnt = N
for i in range(N):
    q = queue.PriorityQueue()
    for j in range(N):
        q.put((A[j], 0), A[j]*10000)
    max_cnt = 0
    for j in range(N):
        t = q.get()
        q.put((B[j-i]//2+t[0], t[1]+1), ((B[j-i]//2+t[0])*10000+t[1]+1))
        max_cnt = max(max_cnt, t[1]+1)
    min_max_cnt = min(min_max_cnt, max_cnt)
print(min_max_cnt)