The students in the science and technology group are going to make a cuboid frame with a base circumference of 18 cm and a height of 3 cm. How many centimeters of iron wire do they need at least?
科技小组的同学要做一个底面周长是18厘米，高3厘米的长方体框架，至少需要多少厘米长的铁丝呢？
<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">36 + 12</gadget>
<output>48</output>

<result>48</result>