Xiaoliang has to walk a total of 1800 meters from home to school, and after walking the number of meters, there is exactly 1 kilometer left.
小亮从家到学校一共要走1800米，走了多少米后正好还剩1千米．
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">1_800 - 1_000</gadget>
<output>800</output>

<result>800</result>