Use iron wire to tie four logs with a cross-sectional diameter of 20 cm together. If the length of the iron wire at the joint is 5 cm, how many centimeters of iron wire do you need at least for one round? (drawing analysis)
用铁丝把4根横截面直径都是20厘米的圆木捆在一起，如果接头处铁丝长5厘米，那么捆一周至少需要多少厘米的铁丝？(画图分析)
<gadget id="calculator">3.14 * 20</gadget>
<output>62.8</output>

<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<gadget id="calculator">62.8 + 80</gadget>
<output>142.8</output>

<result>142.8</result>