Combine 3, 4, 5, 6 with +, -, *, /, how many to form 24.
以+、-、*、/、多少，将3、4、5、6组合成24．
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">4 * 6</gadget>
<output>24</output>

<result>24</result>