The circumference of a circular fountain is 62.8 meters. After the diameter of the pool is widened by 1 meter, railings are enclosed outside. How many meters is the railing?
一个圆形喷水池的周长62.8米，给水池直径加宽1米后在外面围上栏杆．栏杆长多少米？
<gadget id="calculator">62.8 / 3.14</gadget>
<output>20</output>

<gadget id="calculator">20 + 1</gadget>
<output>21</output>

<gadget id="calculator">3.14 * 21</gadget>
<output>65.94</output>

<result>65.94</result>