Passengers on the bus: There are 54 passengers on a bus, which departs from the starting point. When it reaches the first stop, 8 people get off and 2 get on the bus; when it reaches the second stop, 9 people get off, 3 people get on the bus; at the third stop, 5 people get off the bus and 3 people get on the bus. Children, how many passengers are there in the car at this time?
车上的乘客：一辆公共汽车上有54名乘客，从起点站开出，到达第一站时，有8人下车，2人上车；到第二站时，有9人下车，3人上车；到第三站时，有5人下车，3人上车．小朋友们，这个时候车上还有多少乘客．
<gadget id="calculator">3 - 8 - 9 - 5</gadget>
<output>-19</output>

<gadget id="calculator">54 + 2 + 3 + (-19)</gadget>
<output>40</output>

<result>40</result>