soda wholesaler is running a promotion, and stipulates that 4 empty bottles can be exchanged for a bottle of soda. A supermarket wants to buy 2,000 bottles of soda, and some of them can be exchanged for empty bottles. How many bottles of soda do they want to buy?
汽水批发商搞促销，规定4个空瓶可以兑换一瓶汽水，某超市想购进2000瓶汽水，其中有一些汽水可以用空瓶换，那么他们要买汽水多少瓶？
<gadget id="calculator">2_000 / 4</gadget>
<output>500</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">500 * 3</gadget>
<output>1_500</output>

<result>1_500</result>