Zhang Lin made a cuboid paper box with a length of 8 cm, a width of 4 cm, and a height of 3 cm. How many square centimeters of paper did she use?
张琳做了一个长方体纸盒，长8厘米，宽4厘米，高3厘米，她一共用了多少平方厘米的纸？
<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">32 + 24 + 12</gadget>
<output>68</output>

<gadget id="calculator">68 * 2</gadget>
<output>136</output>

<result>136</result>