A railway with a total length of 5 kilometers has been repaired for 8 days, with an average of 300 meters per day. Is it the remaining long hair, or the long hair that has been repaired? How many meters long?
一条铁路全长5千米，已经修了8天，平均每天修300米．是剩下的长，还是已经修好的长？长多少米？
<gadget id="calculator">5 * 1_000</gadget>
<output>5_000</output>

<gadget id="calculator">300 * 8</gadget>
<output>2_400</output>

<gadget id="calculator">5_000 - 2_400 - 2_400</gadget>
<output>200</output>

<result>200</result>