A classroom is 8 meters long, 6 meters wide, and 4 meters high. It is necessary to paint the walls and top of the classroom. If the area of doors and windows is 25 square meters, if 0.4 kilograms of lime is used per square meter, how many kilograms of lime is needed to paint this classroom?
一间教室长8米，宽6米，高4米，要粉刷教室的墙壁和顶部，扣除门窗面积25平方米，如果每平方米需要用0.4千克白灰，粉刷这间教室一共需多少千克白灰？
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">32 + 24</gadget>
<output>56</output>

<gadget id="calculator">56 * 2</gadget>
<output>112</output>

<gadget id="calculator">112 - 25</gadget>
<output>87</output>

<gadget id="calculator">48 + 87</gadget>
<output>135</output>

<gadget id="calculator">135 * 0.4</gadget>
<output>54</output>

<result>54</result>