There are three identical cuboids, the length, width and height are 30cm, 20cm, and 10cm respectively; now pack them into a package, how much cm can be saved at most in wrapping paper**2.
有三个同样的长方体，长宽高分别是30cm，20cm，10cm；现在把它们包成一包，最多可以节约包装纸是多少cm**2．
<gadget id="calculator">30 * 20 * 4</gadget>
<output>2_400</output>

<result>2_400</result>