A cuboid of wood with a length of 80 cm, a width of 5 cm, and a height of 3 cm is sawn into two sections of 40 cm in length, and the surface area is increased by how many square centimeters.
把一根长80厘米，宽5厘米，高3厘米的长方体木料锯成长都是40厘米的两段，表面积比原来增加了多少平方厘米．
<gadget id="calculator">5 * 3 * 2</gadget>
<output>30</output>

<result>30</result>