In the activity of creating a strong education area in our district, the school has to paint the walls and ceiling of a classroom. A classroom is 8 meters long, 6 meters wide, and 3 meters high. The area of doors, windows and blackboards is 22 square meters. 0.5 kg of paint for rice, at least how many kilograms of paint is needed?
在我区创建教育强区活动中，学校要粉刷一间教室内的四壁及天花板，一间教室长8米，宽6米，高3米，扣除门窗和黑板面积22平方米，如果每平方米用涂料0.5千克，至少需要多少千克涂料？
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

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

<gadget id="calculator">48 + 24 + 18</gadget>
<output>90</output>

<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<gadget id="calculator">180 - 48 - 22</gadget>
<output>110</output>

<gadget id="calculator">110 * 0.5</gadget>
<output>55</output>

<result>55</result>