How many square centimeters of iron sheets are needed to make 12 cube iron boxes with a side length of 15 cm without a cover?
做12个无盖的棱长为15厘米的正方体铁盒，至少需要铁皮多少平方厘米？
<gadget id="calculator">15 * 15 * 5 * 12</gadget>
<output>13_500</output>

<result>13_500</result>