cylindrical gasoline barrel with a bottom radius of 0.25 meters, Master Zhang wants to put it down and roll it to the wall at a distance of 15.7 meters, how many times does the gasoline barrel roll?
一个底面半径为0.25米的圆柱形汽油桶，张师傅要把它放倒，滚到距离15.7米的墙边，这个汽油桶要滚动多少圈？
<gadget id="calculator">2 * 3.14 * 0.25</gadget>
<output>1.57</output>

<gadget id="calculator">15.7 / 1.57</gadget>
<output>10</output>

<result>10</result>