How many square centimeters of wooden boards are needed to make a cubic wooden box without a lid whose edge length is 30 centimeters?
做1个棱长是30厘米的无盖正方体木盒，需木板多少平方厘米？
<gadget id="calculator">30 * 30 * 5</gadget>
<output>4_500</output>

<result>4_500</result>