How many cubic centimeters of wood need to be cut from a cube with a side length of 20 cm to form the largest cylinder?
把一个棱长是20厘米的正方体木块削成一个最大的圆柱，需要削去多少立方厘米的木块．
<gadget id="calculator">20 * 20 * 20</gadget>
<output>8_000</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 20</gadget>
<output>6_280</output>

<gadget id="calculator">8_000 - 6_280</gadget>
<output>1_720</output>

<result>1_720</result>