Four beer bottles with a diameter of 8 cm are tied up with a rope. How many centimeters should the rope be at least?
直径是8厘米的啤酒瓶4个，用绳子捆起来，绳子长至少要多少厘米？
<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">3.14 * 8</gadget>
<output>25.12</output>

<gadget id="calculator">32 + 25.12</gadget>
<output>57.12</output>

<result>57.12</result>