The school library is 16 meters long, 8 meters wide, and 3 meters high. The area of doors and windows is 40 square meters. To paint the walls and ceiling of this library, if 250 grams of paint is needed per square meter, how many kilograms of paint are needed in total?
学校图书室长16米，宽8米，高3米，门窗面积为40平方米，要粉刷这个图书室的四壁和天花板，如果每平方米需用油漆250克，共需多少千克的油漆？
<gadget id="calculator">16 * 8</gadget>
<output>128</output>

<gadget id="calculator">16 * 3</gadget>
<output>48</output>

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

<gadget id="calculator">48 + 24</gadget>
<output>72</output>

<gadget id="calculator">72 * 2</gadget>
<output>144</output>

<gadget id="calculator">144 - 40</gadget>
<output>104</output>

<gadget id="calculator">128 + 104</gadget>
<output>232</output>

<gadget id="calculator">250 / 1_000</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">232 * (1/4)</gadget>
<output>58</output>

<result>58</result>