Xiaozhen's room is 3.5 meters long, 3 meters wide and 3 meters high. Excluding the 5 square meters of doors and windows, the walls and roof of the room are covered with wallpaper. What is the minimum area of wallpaper needed for this room?
小珍的房间长3.5米，宽3米，高3米．除去门窗5平方米，房间的墙壁和房顶都贴上墙纸，这个房间至少需要多大面积的墙纸？
<gadget id="calculator">3.5 * 3</gadget>
<output>10.5</output>

<gadget id="calculator">3.5 * 3 * 2</gadget>
<output>21</output>

<gadget id="calculator">3 * 3 * 2</gadget>
<output>18</output>

<gadget id="calculator">18 - 5</gadget>
<output>13</output>

<gadget id="calculator">10.5 + 21 + 13</gadget>
<output>44.5</output>

<result>44.5</result>