The school's multimedia classroom is 20 meters long, 15 meters wide, and 8 meters high. The ceiling and surrounding walls of the classroom need to be painted (of which the door and window area is 120 square meters). How many square meters is the area to be painted?
学校多媒体教室长20米，宽15米，高8米，要粉刷该教室的顶棚和四周墙壁(其中门窗面积120平方米)，要粉刷的面积是多少平方米？
<gadget id="calculator">20 + 15</gadget>
<output>35</output>

<gadget id="calculator">35 * 2 * 8</gadget>
<output>560</output>

<gadget id="calculator">20 * 15</gadget>
<output>300</output>

<gadget id="calculator">300 - 120</gadget>
<output>180</output>

<gadget id="calculator">560 + 180</gadget>
<output>740</output>

<result>740</result>