There were 1,563 passengers on the train from Beijing to Shanghai, 259 got off at Jinan Station, and 284 boarded. Did the number of passengers on the train increase or decrease? How many passengers were there in the car at this time?
从北京开往上海的火车上有乘客1563人，到济南站下车259人，上车284人，这时车上的乘客是增加了还是减少了？这时车上有乘客多少人？
<gadget id="calculator">1_563 - 259</gadget>
<output>1_304</output>

<gadget id="calculator">1_304 + 284</gadget>
<output>1_588</output>

<result>1_588</result>