The school needs to repaint the 4 pillars in the corridor. The circumference of the bottom of the pillars is 3.14 meters, the height is 3 meters, and 1 kilogram of paint covers 2 square meters. How many kilograms of paint are needed in total?
学校要给走廊里的4根柱子重新涂油漆，柱子的底面周长是3.14米，高是3米，1千克油漆涂2平方米，一共需要油漆多少千克？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">3.14 * 3 * 2</gadget>
<output>18.84</output>

<result>18.84</result>