A cube has a side length of 3 cm. A cube with a side length of 1 cm is dug out from the center of each of its front, back, left, right, upper and lower faces to make a toy. Find the surface area of the toy.
一个正方体的棱长为3厘米，在它的前、后、左、右、上、下各面中心各挖去一个棱长为1厘米的正方体做成一种玩具，求这个玩具的表面积．
<gadget id="calculator">3 * 3 * 6</gadget>
<output>54</output>

<gadget id="calculator">1 * 1 * 6 * 4</gadget>
<output>24</output>

<gadget id="calculator">54 + 24</gadget>
<output>78</output>

<result>78</result>