A cylindrical grain bank (thickness is negligible), with a bottom diameter of 4m and a height of 5m. After it is filled with rice, the rice is piled up on the grain bank to form a cone with a height of 0.3m. If the mass of rice per cubic meter It is 500kg, how many kilograms are there in total?
一个圆柱形粮囤(厚度忽略不计)，底面直径为4m，高5m，装满稻谷后，又在粮囤上把稻谷最大限度地堆成一个0.3m高的圆锥，如果每立方米稻谷的质量为500kg，这些稻谷一共有多少千克？
<gadget id="calculator">62.8 + 0.314</gadget>
<output>63.114</output>

<gadget id="calculator">63.114 * 500</gadget>
<output>31_557</output>

<result>31_557</result>