If two cuboids with a length of 5 cm, a width of 4 cm, and a height of 3 cm are put together to form a large cuboid, what is the maximum reduction in the surface area in square centimeters?
把两个长5厘米，宽4厘米，高3厘米的长方体拼成一个大长方体，表面积最多减少多少平方厘米．
<gadget id="calculator">4 * 5 * 2</gadget>
<output>40</output>

<result>40</result>