The standard runway of the stadium is 400 meters long. Xiao Ming has already run 2 laps, and how many meters to run is exactly 1 kilometer.
体育场标准跑道长400米，小明已经跑了2圈，再跑多少米正好是1千米．
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">400 * 2</gadget>
<output>800</output>

<gadget id="calculator">1_000 - 800</gadget>
<output>200</output>

<result>200</result>