What is the surface area of a cubic pen holder whose sum of sides is 144 cm?
一个立方体笔筒，棱长总和为144厘米，它的表面积是多少平方厘米．
<gadget id="calculator">144 / 12</gadget>
<output>12</output>

<gadget id="calculator">12 * 12 * 6</gadget>
<output>864</output>

<result>864</result>