There were 985 passengers on the train from Wuhan to Beijing, 579 people got off at Handan Station, and 458 people got on the train. Did the number of passengers on the train increase or decrease? How many passengers are there in total on the train?
从武汉开往北京的火车上有乘客985人，到邯郸站下车579人，上车458人，这时火车上的乘客是增加还是减少了？这时火车上共有乘客多少人？
<gadget id="calculator">985 - 579</gadget>
<output>406</output>

<gadget id="calculator">406 + 458</gadget>
<output>864</output>

<result>864</result>