A cube with an edge length of 3 cm is drawn in three directions: up-down, left-right, and front-back. A square hole with a side length of 1 cm is punched from the middle of each of the six faces of the cube to penetrate the entire cube. What is the surface area of the "perforated" cube in square centimeters?
一个棱长是3厘米的正方体，沿上下、左右及前后三个方向．从正方体的六个面的中间各打出一个边长为1厘米的方形孔洞贯通整个正方体．则这个被"打孔"的正方体的表面积是多少平方厘米．
<gadget id="calculator">3 * 3 * 6</gadget>
<output>54</output>

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

<gadget id="calculator">54 - 6</gadget>
<output>48</output>

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

<gadget id="calculator">48 + 24</gadget>
<output>72</output>

<result>72</result>