Summer is here, and Uncle Wang bought 3 bottles of "Jinling Dry Beer" at the canteen. The salesperson tied the 3 bottles of beer together and tied them 2 times (excluding the joints). How many centimeters of packing rope should be used at least? (The diameter of a beer bottle is 8 cm.)
夏天到了，王叔叔到小卖部买了3瓶"金陵干啤"，售货员将这3瓶啤酒捆在了一起，捆2圈(不计接头处)，至少要用包装绳多少厘米？(啤酒瓶的直径是8厘米．)
<gadget id="calculator">3.14 * 20</gadget>
<output>62.8</output>

<gadget id="calculator">20 * 3</gadget>
<output>60</output>

<gadget id="calculator">62.8 + 60</gadget>
<output>122.8</output>

<gadget id="calculator">122.8 * 2</gadget>
<output>245.6</output>

<result>245.6</result>