There are 46 students in a class, 17 of them can ride bicycles, 14 can swim, and 5 can ride and swim. How many people know neither?
某班有学生46人，其中会骑自行车的有17人，会游泳的有14人，既会骑车又会游泳的有5人．两样都不会的有多少人？
<gadget id="calculator">14 - 5</gadget>
<output>9</output>

<gadget id="calculator">17 + 9</gadget>
<output>26</output>

<gadget id="calculator">46 - 26</gadget>
<output>20</output>

<result>20</result>