An auditorium is 20 meters long, 16 meters wide, and 7 meters high. To paint the ceiling and surrounding walls of the auditorium, the area of doors and windows is 80 square meters, and an average of 0.5 kilograms of paint is used per square meter. How many kilograms of paint are needed in total?
一个礼堂长20米，宽16米，高7米，要粉刷礼堂的顶棚和四周墙壁，除去门窗面积80平方米，平均每平方米用涂料0.5千克，那么一共需要多少千克涂料？
<gadget id="calculator">20 * 16</gadget>
<output>320</output>

<gadget id="calculator">20 * 7 * 2</gadget>
<output>280</output>

<gadget id="calculator">16 * 7 * 2</gadget>
<output>224</output>

<gadget id="calculator">224 - 80</gadget>
<output>144</output>

<gadget id="calculator">320 + 280 + 144</gadget>
<output>744</output>

<gadget id="calculator">0.5 * 744</gadget>
<output>372</output>

<result>372</result>