The supermarket downstairs of Xiao Ming’s house has such a rule: After drinking a drink, you can exchange 5 empty drink bottles for a drink. Xiao Ming bought 20 bottles of drinks, how many bottles of drinks can he drink at most?
小明家楼下的超市有这样一条规定：喝完饮料后，用5个空饮料瓶可以换一瓶饮料，小明家买了20瓶饮料，他最多能喝到多少瓶饮料？
<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">20 + 4</gadget>
<output>24</output>

<gadget id="calculator">24 + 1</gadget>
<output>25</output>

<result>25</result>