To decorate a conference room with a length of 9m, a width of 6m, and a height of 4m, paste plastic wallpaper around the conference room and the ceiling, deduct the area of doors and windows of 20m**2, how much m**2 of wallpaper is needed at least?
装修一间长9m，宽6m，高4m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20m**2，至少需要壁纸多少m**2？
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