How many decimeters of steel bars are needed to make a cuboid frame whose length and width are 4 decimeters and whose height is 10 decimeters?
用钢筋做一个长和宽都是4分米，高是10分米的长方体框架，需多少分米的钢筋？
<gadget id="calculator">4 + 4 + 10</gadget>
<output>18</output>

<gadget id="calculator">18 * 4</gadget>
<output>72</output>

<result>72</result>