How many decimeters of steel bars are needed to make a cuboid whose length and width are 3.5 decimeters and the height is 10 centimeters?
用钢筋做一个长和宽都是3.5分米，高是10厘米的长方体，需多少分米的钢筋？
<gadget id="calculator">10 / 10</gadget>
<output>1</output>

<gadget id="calculator">3.5 + 3.5 + 1</gadget>
<output>8</output>

<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<result>32</result>