Divide a cuboid block whose length, width and height are 20cm, 30cm, and 40cm respectively into four identical small cuboid blocks, how much cm will increase the surface area at most**2.
将一块长宽高分别为20cm、30cm、40cm的长方体木块，分割成四个完全相同的小长方体木块，表面积最多增加多少cm**2．
<gadget id="calculator">30 * 40 * 6</gadget>
<output>7_200</output>

<result>7_200</result>