import copy

n = int(input())

allies = map(int, input().split())
enemies = list(map(int, input().split()))

allies_mon = []
for i in allies:
    allies_mon.append([i, 0])

max = 0
for i in range(n):
    allies_c = copy.deepcopy(allies_mon)
    m = i
    for _ in range(n):
        j = allies_c.index(min(allies_c))
        allies_c[j][0] += enemies[m] // 2
        allies_c[j][1] += 1
        m += 1
        if m >= n:
            m = 0

    for ac in allies_c:
        if max < ac[1]:
            max = ac[1]

print(max)