The runway on the playground is 400 meters long, and the number of laps you run around it is exactly 2 kilometers.
操场跑道长400米，绕着它跑多少圈正好是2千米．
<gadget id="calculator">2 * 1_000</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 / 400</gadget>
<output>5</output>

<result>5</result>