A conical wheat pile has a bottom circumference of 12.56 meters and a height of 1.8 meters. Each cubic meter of wheat weighs about 700 kilograms. Calculated based on an 80% flour extraction rate, how much flour can be ground from this pile of wheat?
一个圆锥形麦堆，底面周长12.56米，高1.8米，每立方米的小麦约重700千克，按出粉率80%计算，这堆小麦可磨出多少面粉？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">(1/3) * 3.14 * 4 * 1.8</gadget>
<output>7.536</output>

<gadget id="calculator">700 * 7.536</gadget>
<output>5_275.2</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5_275.2 * (4/5)</gadget>
<output>4_220.16</output>

<result>4_220.16</result>