Winnie the Pooh bought a new 20 cm cylindrical pencil with a base diameter of 0.8 cm. After the tip of the pencil is cut into a cone shape with a height of 1.5 cm, how many cubic centimeters does the volume of the new pencil decrease compared to the original one?
小熊维尼买了一枝20厘米的圆柱形新铅笔，底面直径是0.8厘米，把铅笔的笔头削成高是1.5厘米的圆锥形后，新铅笔的体积比原来减少了多少立方厘米？
<gadget id="calculator">0.8 / 2</gadget>
<output>0.4</output>

<gadget id="calculator">0.4 ** 2</gadget>
<output>0.16</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">3.14 * 0.16 * 1.5 * (2/3)</gadget>
<output>0.5024</output>

<result>0.5024</result>