A store stipulates: "Three empty soda bottles can be exchanged for one bottle of soda, without additional payment." Xi Rui bought 16 bottles of soda without spending money, and he can drink as many bottles of soda at most.
某商店规定："用三个空汽水瓶可以换一瓶汽水，不用另外付钱．"希瑞买了16瓶汽水，不再花钱，他最多可以喝上多少瓶汽水．
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">16 + 8</gadget>
<output>24</output>

<result>24</result>