To make a cuboid carton with a length of 4 decimeters, a width of 3 decimeters, and a height of 2 decimeters, how many square decimeters of cardboard should be used at least?
做一个长长4分米，宽3分米，高2分米的长方体纸盒，至少要用多少平方分米的纸板？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">12 + 8 + 9</gadget>
<output>29</output>

<gadget id="calculator">29 * 2</gadget>
<output>58</output>

<result>58</result>