Cut a cuboid whose length, width, and height are 8 decimeters, 5 decimeters, and 10 decimeters respectively into two small cuboids. What is the maximum sum of the surface areas of these two small cuboids?
把一个长、宽、高分别是8分米、5分米、10分米的长方体截成两个小长方体，这两个小长方体表面积之和最大是多少平方分米．
<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<gadget id="calculator">10 * 5</gadget>
<output>50</output>

<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">80 + 50 + 40</gadget>
<output>170</output>

<gadget id="calculator">170 * 2</gadget>
<output>340</output>

<gadget id="calculator">10 * 8 * 2</gadget>
<output>160</output>

<gadget id="calculator">340 + 160</gadget>
<output>500</output>

<result>500</result>