A cylindrical well with a circumference of 6.28 meters is 10 meters deep, and its usual water storage depth is 0.8 times the depth of the well. How many cubic meters of water does this well usually have?
一口周长是6.28米的圆柱形水井，它的深是10米，平时蓄水深度是井深的0.8倍，这口井平时的水量是多少立方米？
<gadget id="calculator">6.28 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 10 * 0.8</gadget>
<output>25.12</output>

<result>25.12</result>