import copy, queue

if __name__ == '__main__':
    n = int(input())
    ally_levels = [int(a) for a in input().split()]
    enemy = [int(b) for b in input().split()]

    answer = 0
    for start in range(n):
        ally = queue.PriorityQueue()
        for ally_level in ally_levels: ally.put((ally_level, 0))

        max_cnt = 0
        for diff in range(n):
            level, cnt = ally.get()
            i = (start + diff) % n

            max_cnt = max(max_cnt, cnt + 1)
            ally.put((level + enemy[i] // 2, cnt + 1))
        
        answer = max(max_cnt, answer)
    
    print(answer)