There is a cylindrical grain storehouse, the radius and height of the bottom surface measured from the inside are both 2m. If each cubic meter of rice weighs 500kg, how many kilograms of rice can this grain store hold?
有一个圆柱形的粮囤，从里面量底面半径和高都是2m．如果每立方米稻谷重500kg，这个粮囤能装稻谷多少千克？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 2</gadget>
<output>25.12</output>

<gadget id="calculator">500 * 25.12</gadget>
<output>12_560</output>

<result>12_560</result>