The school auditorium is 18 meters long, 12 meters wide, and 4 meters high. Now it is going to paint the surrounding walls and roof, and remove the door and window area of 36 square meters. If every kilogram of latex paint can paint 12 square meters, how many kilograms of latex paint are needed?
学校礼堂长18米、宽12米、高4米，现在准备粉刷四周墙壁和屋顶，去除门窗面积36平方米．如果每千克乳胶漆可粉刷12平方米，共需乳胶漆多少千克？
<gadget id="calculator">18 * 4</gadget>
<output>72</output>

<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<gadget id="calculator">72 + 48</gadget>
<output>120</output>

<gadget id="calculator">120 * 2</gadget>
<output>240</output>

<gadget id="calculator">18 * 12</gadget>
<output>216</output>

<gadget id="calculator">240 + 216</gadget>
<output>456</output>

<gadget id="calculator">456 / 12</gadget>
<output>38</output>

<result>38</result>