The number of candidates in the examination room is 021-046, indicating how many candidates there are in the examination room.
考场上考生的编号是021-046，说明这个考场有多少名考生．
<gadget id="calculator">46 - 21</gadget>
<output>25</output>

<gadget id="calculator">25 + 1</gadget>
<output>26</output>

<result>26</result>