A "Rubik's Cube" is a large cube made up of 27 small cubes with a side length of 2 cm. What is the sum of the side lengths of this Rubik's Cube?
一个"魔方"是由27个棱长为2厘米的小正方体拼合而成的大正方体，这个魔方的棱长和是多少？
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">12 * 6</gadget>
<output>72</output>

<result>72</result>