classroom is 12 meters long, 6 meters wide, and 3 meters high. Its walls and ceiling need to be painted. Excluding doors and windows, the area of the blackboard is 25 square meters. If the paint is 0.8 kg per square meter, how much paint is needed?
一间教室长12米，宽6米，高3米，要粉刷它的四壁和顶部，除去门窗，黑板的面积25平方米，如果每平方米涂料0.8千克，共需多少涂料？
<gadget id="calculator">12 * 6</gadget>
<output>72</output>

<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">72 + 36 + 18</gadget>
<output>126</output>

<gadget id="calculator">126 * 2</gadget>
<output>252</output>

<gadget id="calculator">252 - 72 - 25</gadget>
<output>155</output>

<gadget id="calculator">155 * 0.8</gadget>
<output>124</output>

<result>124</result>