There are 8 large cylindrical pillars in a conference hall. The circumference of the bottom of the pillars is 2.5 meters and the height is 5 meters. According to the calculation that 1 kilogram of paint can paint 4 square meters, how many kilograms of paint should be used to paint these pillars?
一个会议厅有8根圆柱形的大柱子，柱子的底面周长2.5米，高5米；按1千克油漆可漆4平方米计算，漆完这些柱子要用多少千克油漆？
<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">2.5 * 5 * 2</gadget>
<output>25</output>

<result>25</result>