A cylindrical reservoir with a bottom diameter of 4 meters, a depth of 4 meters, and a water surface 0.5 meters above the ground. How many cubic meters of water can this reservoir hold?
一个圆柱形蓄水池，底面直径4米、深4米，水面离地面0.5米．这个蓄水池可蓄水多少立方米？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">4 - 0.5</gadget>
<output>3.5</output>

<gadget id="calculator">3.14 * 4 * 3.5</gadget>
<output>43.96</output>

<result>43.96</result>