The product packaging design of a certain factory is: each piece has a large carton, containing 4 medium cartons; each medium carton contains 6 small cartons. How many cartons are needed for each piece of this product.
某工厂的产品包装设计是：每件一个大纸盒，内装4个中纸盒；每个中纸盒内装6个小纸盒．这种产品每件一共要用多少个纸盒．
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">1 + 4 + 24</gadget>
<output>29</output>

<result>29</result>