A cylindrical glass with an inner diameter of 8 cm contains water with a depth of 16 cm. The water occupies exactly 80% of the volume of the glass. What is the volume of the glass in milliliters?
一个内直径是8厘米的圆柱形玻璃杯，内装深16厘米的水，这些水恰好占这个杯子容积的80%，这个杯子的容积是多少毫升？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

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

<gadget id="calculator">80 / 100</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>