Naughty uses thick paper to make a cuboid pen holder. It is known that this pen holder is 8 cm long, 6 cm wide, and 12 cm high. How much thick cardboard does he use to make this pen holder? (not counting joints)
淘气用厚纸做一个长方体的插笔筒，已知这个这个笔筒长8厘米，宽6厘米，高是12厘米，他做这个笔筒要用多少厚纸板？(接头处不计)
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

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

<gadget id="calculator">6 * 12 * 2</gadget>
<output>144</output>

<gadget id="calculator">48 + 192 + 144</gadget>
<output>384</output>

<result>384</result>