The height of the pillar is 3 meters, and the circumference of the base is 3.14 meters. Paint 5 pillars like this, and use 0.5 kilograms of paint per square meter. How many kilograms of paint will be used in total?
柱子高3米，底面周长3.14米．给5根这样的柱子刷油漆，每平方米用油漆0.5千克，一共要用油漆多少千克？
<gadget id="calculator">3.14 * 3</gadget>
<output>9.42</output>

<gadget id="calculator">9.42 * 5</gadget>
<output>47.1</output>

<gadget id="calculator">47.1 * 0.5</gadget>
<output>23.55</output>

<result>23.55</result>