Make a box with a length of 6 cm, width of 5 cm, and height of 3 cm. The lid can be opened and closed.
做一个长6cm、宽5cm、高3cm的有盖盒子，盖子能打开、合上．
<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">30 + 18 + 15</gadget>
<output>63</output>

<gadget id="calculator">63 * 2</gadget>
<output>126</output>

<result>126</result>