A cylindrical grain storehouse has a base radius of 1 meter measured from the inside and a height of 2 meters. If each cubic meter of rice weighs about 500 kilograms, how many tons of rice can this grain store hold?
一个圆柱形粮囤，从里面量得底面半径是1米，高2米．如果每立米稻谷约重500千克，这个粮囤能装多少吨稻谷？
<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">500 / 1_000</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3.14 * 1 * 2 * (1/2)</gadget>
<output>3.14</output>

<result>3.14</result>