There are 560 passengers on the train from Beijing to Shanghai, 287 people get off at Jinan Station, and 234 people get on the train. How many people are on the train at this time?
从北京到上海的列车上有乘客560人，到济南站下车287人，上车234人，这时车上有多少人？
<gadget id="calculator">560 - 287</gadget>
<output>273</output>

<gadget id="calculator">273 + 234</gadget>
<output>507</output>

<result>507</result>