A cylindrical cistern with a bottom circumference of 25.15 meters and a height of 4 meters is plastered with cement along the perimeter and bottom of the cistern. If 5 square meters can be painted per kilogram of cement, how many kilograms of cement are needed in total?
一个圆柱形蓄水池，底面周长25.15米，高4米，沿着这个蓄水池的四周及底部抹水泥．如果每千克水泥可涂5平方米，一共需多少千克水泥？
<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<gadget id="calculator">25.12 * 4</gadget>
<output>100.48</output>

<gadget id="calculator">50.24 + 100.48</gadget>
<output>150.72</output>

<gadget id="calculator">150.72 / 5</gadget>
<output>30.144</output>

<result>30.144</result>