def solve(block_a, block_b):
    block_a = list(sorted(block_a, reverse=True))
    block_b = list(sorted(block_b, reverse=True))

    ans = 0
    last = -1
    height = 2 ** 64
    change = True
    while change:
        change = False
        block_list = block_a if last == -1 else block_b

        for block in block_list:
            if block < height:
                ans += 1
                height = block
                last *= -1
                change = True
                break

    return ans


def main():
    nw = int(input())
    w = list(map(int, input().split()))
    nb = int(input())
    b = list(map(int, input().split()))
    print(max(solve(w, b), solve(b, w)))

if __name__ == '__main__':
    main()