Build a cylindrical pool with a bottom diameter of 2 meters and a depth of 2 meters. Put cement on the bottom of the pool and its surroundings. Use 20 kilograms of cement per square meter. How many kilograms of cement will be used in total?
修建一个圆柱形水池，水池底面直径是2米，深2米，在水池底部和四周抹上水泥，每平方米用水泥20千克，一共用水泥多少千克？
<gadget id="calculator">3.14 * 2 * 2</gadget>
<output>12.56</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

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

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

<gadget id="calculator">12.56 + 3.14</gadget>
<output>15.7</output>

<gadget id="calculator">15.7 * 20</gadget>
<output>314</output>

<result>314</result>