An acrobat performs a unicycle tightrope walk. The diameter of the wheel is 50 centimeters. To ride a 157-meter-long steel wire, how many times does the wheel turn?
杂技演员表演独轮车走钢丝，车轮的直径是50厘米，要骑车157米长的钢丝，车轮要转动几圈？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3.14 * (1/2)</gadget>
<output>1.57</output>

<gadget id="calculator">157 / 1.57</gadget>
<output>100</output>

<result>100</result>