The canteen of the summer camp base stipulates that every three empty soda bottles can be exchanged for one soda. If Li Ming buys 6 bottles of soda, how many friends can he drink at most?
夏令营基地小卖部，规定：每三个空汽水瓶可以换一瓶汽水，．李明如果买6瓶汽水，那么他最多可以让多少位小伙伴喝到汽水．
<gadget id="calculator">6 / 3</gadget>
<output>2</output>

<gadget id="calculator">6 + 2 + 1</gadget>
<output>9</output>

<result>9</result>