A cylindrical granary with a bottom circumference of 31.4 meters and a height of 5 meters is filled with rice. The mass of rice per cubic meter is 800 kg. How many tons of rice coexist in this granary?
一个圆柱形粮仓，底面周长为31.4米，高5米，里面装满了稻谷．每立方米稻谷的质量是800千克．这个粮仓共存稻谷多少吨？
<gadget id="calculator">31.4 / 3.14 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">800 / 1_000</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3.14 * 25 * 5 * (4/5)</gadget>
<output>314</output>

<result>314</result>