A cylindrical barn has a bottom diameter of 4 meters and a height of 1.5 meters. If the mass of rice per cubic meter is 800 kg, how many kilograms of rice can this barn hold at most?
一个圆柱形谷仓，底面直径为4米，高1.5米，如果每立方米稻谷的质量为800kg，这个谷仓最多能装稻谷多少千克？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4 * 1.5 * 800</gadget>
<output>15_072</output>

<result>15_072</result>