To make a cuboid carton with a length of 5 cm, a width of 3 cm, and a height of 2 cm, at least how many square centimeters of cardboard should be used?
做一个长5厘米，宽3厘米，高2厘米的长方体纸盒，至少要用多少平方厘米硬纸板？
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">15 + 10 + 6</gadget>
<output>31</output>

<gadget id="calculator">31 * 2</gadget>
<output>62</output>

<result>62</result>