One lap of the school playground is 200 meters, Xiao Gang ran two laps, and how many meters to run is 1 kilometer.
学校操场1圈是200米，小刚跑了2圈，再跑多少米就是1千米．
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">200 * 2</gadget>
<output>400</output>

<gadget id="calculator">1_000 - 400</gadget>
<output>600</output>

<result>600</result>