A conical wheat pile has a base radius of 2 meters and a height of 1.5 meters. Each cubic meter of wheat weighs about 700 kilograms. If the flour extraction rate is 80%, how many kilograms of flour can be produced from this pile of wheat?
一个圆锥形麦堆，底面半径是2米，高是1.5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千克面粉？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">3.14 * 4 * 1.5 * (1/3) * 700 * (4/5)</gadget>
<output>3_516.8</output>

<result>3_516.8</result>