fill_the_box

def fill_the_box(*args):
    from collections import deque
    box_volume = args[0] * args[1] * args[2]
    new_cubes = deque(args[3:])

    while box_volume and new_cubes:
        current_cube = new_cubes.popleft()
        if current_cube == 'Finish':
            break
        if box_volume - current_cube >= 0:
            box_volume -= current_cube
        else:
            new_cubes.appendleft(current_cube-box_volume)
            box_volume = 0

    if not box_volume:
        return f"No more free space! You have {sum([n for n in new_cubes if str(n).isdigit()])} more cubes."
    else:
        return f"There is free space in the box. You could put {box_volume} more cubes."


print(fill_the_box(10, 10, 10, 40, "Finish", 2, 15, 30))