If a number is divided by 4 or 5, the remainder is 3. What is the smallest number?
一个数被4、5除都余3，这个数最小是多少．
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">20 + 3</gadget>
<output>23</output>

<result>23</result>