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?
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？
<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 2</gadget>
<output>100.48</output>

<gadget id="calculator">100.48 * 500</gadget>
<output>50_240</output>

<result>50_240</result>