How many square centimeters of cardboard is needed to make a matchbox outer box with a length of 5 cm, a width of 4 cm, and a height of 2.5 cm?
制造一个长5厘米，宽4厘米，高2.5厘米的火柴盒外盒，至少需要多少平方厘米的硬纸皮？
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">5 * 2.5</gadget>
<output>12.5</output>

<gadget id="calculator">20 + 12.5</gadget>
<output>32.5</output>

<gadget id="calculator">32.5 * 2</gadget>
<output>65</output>

<result>65</result>