A cuboid room is 6 meters long, 4 meters wide, and 2.5 meters high. Now it is necessary to paint its four walls and the top surface (the doors and windows occupy 8 square meters without painting). How many square meters is the painted area of this room?
一间长方体的房间，长6米、宽4米、高2.5米．现在要粉刷它的四面墙壁和顶面(其中门窗占8平方米不刷)．这个房间的粉刷面积是多少平方米？
<gadget id="calculator">6 * 2.5</gadget>
<output>15</output>

<gadget id="calculator">4 * 2.5</gadget>
<output>10</output>

<gadget id="calculator">15 + 10</gadget>
<output>25</output>

<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<gadget id="calculator">50 - 8</gadget>
<output>42</output>

<result>42</result>