Stack 3 boxes of health products whose length, width, and height are 30 cm, 20 cm, and 12 cm, respectively, and wrap them together. What is the minimum square centimeter of wrapping paper? (overlaps not counted)
将3盒长、宽、高分别是30厘米，20厘米和12厘米的保健品叠在一起包好，最少要用包装纸多少平方厘米？(重叠部分不计)
<gadget id="calculator">30 * 20</gadget>
<output>600</output>

<gadget id="calculator">30 * 12</gadget>
<output>360</output>

<gadget id="calculator">20 * 12</gadget>
<output>240</output>

<gadget id="calculator">600 + 360 + 240</gadget>
<output>1_200</output>

<gadget id="calculator">1_200 * 2 * 3</gadget>
<output>7_200</output>

<gadget id="calculator">30 * 20 * 4</gadget>
<output>2_400</output>

<gadget id="calculator">7_200 - 2_400</gadget>
<output>4_800</output>

<result>4_800</result>