Roll a piece of rectangular paper with a length of 12.56 cm and a width of 6.28 cm into the largest cylinder. What is the volume of the cylinder in cubic centimeters? (not counting joints)
把一张长12.56厘米，宽6.28厘米的长方形纸，卷成一个最大的圆柱，圆柱的体积是多少立方厘米？(接头处不计)
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 6.28</gadget>
<output>78.8768</output>

<result>78.8768</result>