A cylindrical grain hoard has a base radius of 4 meters and a height of 2 meters when measured from the inside. Each cubic meter of grain weighs about 500 kilograms. How many kilograms of grain can this grain hoard hold? (π takes 3)
一个圆柱形粮囤，从里面量底面半径是4米，高是2米，每立方米粮食约重500千克，这个粮囤大约能盛多少千克粮食？(π取3)
<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3 * 16 * 2</gadget>
<output>96</output>

<gadget id="calculator">96 * 500</gadget>
<output>48_000</output>

<result>48_000</result>