A room is 4.5 meters long, 3.5 meters wide, and 3 meters high. It is necessary to paste wallpaper around the room. After deducting the area of doors and windows of 8 square meters, how many square meters of wallpaper is needed at least?
一个房间长4.5米，宽3.5米，高3米，要在房间的四周贴上墙纸，扣除门窗面积8平方米，至少需要墙纸多少平方米？
<gadget id="calculator">4.5 * 3</gadget>
<output>13.5</output>

<gadget id="calculator">3.5 * 3</gadget>
<output>10.5</output>

<gadget id="calculator">13.5 + 10.5</gadget>
<output>24</output>

<gadget id="calculator">24 * 2</gadget>
<output>48</output>

<gadget id="calculator">48 - 8</gadget>
<output>40</output>

<result>40</result>