To decorate a conference room with a length of 8m, a width of 6m and a height of 3m, paste plastic wallpaper around the conference room and the ceiling, deduct the area of doors and windows of 20m2, how much m2 of wallpaper is needed at least?
装修一间长8m，宽6m，高3m的会议室，在会议室的四周和顶棚贴塑料壁纸，扣除门窗面积20m2，至少需要壁纸多少m2？
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">24 + 18</gadget>
<output>42</output>

<gadget id="calculator">42 * 2</gadget>
<output>84</output>

<gadget id="calculator">84 - 20</gadget>
<output>64</output>

<gadget id="calculator">48 + 64</gadget>
<output>112</output>

<result>112</result>