An acrobat performs a tightrope walk on a unicycle. The diameter of the wheel is 40 cm. To ride a 62.8-meter steel wire, how many revolutions does the wheel have to rotate?
杂技演员表演独轮车走钢丝，车轮的直径为40厘米，要骑过62.8米的钢丝，车轮要转动多少周？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3.14 * (2/5)</gadget>
<output>1.256</output>

<gadget id="calculator">62.8 / 1.256</gadget>
<output>50</output>

<result>50</result>