A classroom is 8 meters long, 6 meters wide, and 3 meters high. If the walls and ceiling of this classroom need to be painted, if 0.5 kilograms of paint is required per square meter, how many kilograms of paint does this classroom need? (The area of doors, windows and blackboards is 26 square meters).
一间教室长8米，宽6米，高3米，要粉刷这间教室的四壁及天棚，如果每平方米要涂料0.5千克，这间教室需要涂料多少千克？(门窗及黑板面积为26平方米)．
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

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

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

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

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

<gadget id="calculator">180 - 48 - 26</gadget>
<output>106</output>

<gadget id="calculator">106 * 0.5</gadget>
<output>53</output>

<result>53</result>