There are 2 columns in the exhibition hall, the height of each column is 4 meters, and the circumference of the bottom is 3.14 meters. Now we need to paint these two pillars again, with an average of 0.3 kilograms of paint per square meter. How many kilograms of paint should we use at least?
展厅里有2根圆柱，每根圆柱的高4米，底面周长是3.14米．现在要把这两根柱子油漆一遍，平均每平方米用漆0.3千克，至少要油漆多少千克？
<gadget id="calculator">3.14 * 4 * 2</gadget>
<output>25.12</output>

<gadget id="calculator">0.3 * 25.12</gadget>
<output>7.536</output>

<result>7.536</result>