A cuboid iron box without a cover is 15 cm long, 12 cm wide, and 8 cm high. If a layer of paint is painted on its outer shell, how many square centimeters is the painted area?
一个无盖的长方体铁盒，长15厘米，宽12厘米，高8厘米，如果在它的外壳涂一层油漆，涂油漆的面积是多少平方厘米？
<gadget id="calculator">15 * 12</gadget>
<output>180</output>

<gadget id="calculator">15 * 8 * 2</gadget>
<output>240</output>

<gadget id="calculator">12 * 8 * 2</gadget>
<output>192</output>

<gadget id="calculator">180 + 240 + 192</gadget>
<output>612</output>

<result>612</result>