The teacher sent Xiao Ming to the cultural store to buy red paper and paste a cuboid donation box, but he forgot the length, width and height of the box. I just remember that it is made of a 40-decimeter wire, and the length, width and height are all integer decimeters. How much should he buy at least to ensure enough?
老师派小明到文化商店去买红纸，要糊长方体募捐箱，但忘了箱子的长，宽，高．只记得是用一根40分米的铁丝做成的，而且长宽高都是整数分米，他至少要买多少才能保证够用？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

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

<gadget id="calculator">12 + 12 + 9</gadget>
<output>33</output>

<gadget id="calculator">33 * 2</gadget>
<output>66</output>

<result>66</result>