A cylindrical glass with an inner diameter of 8 cm and a height of 16 cm for the medicine contained in it is just 4/5 of the capacity of the glass. How much medicine can this glass hold at most?
一个圆柱体玻璃杯，内直径是8厘米，所装药水的高度是16厘米，恰好占杯子容量的(4/5)，这只玻璃杯最多能盛多少药水？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">16 / (4/5)</gadget>
<output>20</output>

<gadget id="calculator">3.14 * 16 * 20</gadget>
<output>1_004.8</output>

<result>1_004.8</result>