There are 10 cylindrical pillars with a base diameter of 0.4 meters and a height of 6 meters in a conference hall. Now they need to be painted with 0.5 grams of paint per square meter. How many kilograms of paint should be used to paint these pillars?
一个会议大厅里有10根底面直径0.4米，高6米的圆柱形柱子，现在要刷上油漆，每平方米用油漆0.5克，刷这些柱子要用油漆多少千克？
<gadget id="calculator">3.14 * 0.4 * 6 * 10 * 0.4</gadget>
<output>30.144</output>

<result>30.144</result>