Xiaolan's room is 6m long, 3m wide, and 3.2m high. Excluding doors and windows 6m**2, the walls and roof of the room are covered with wallpaper. What is the minimum area of wallpaper needed for this room?
小兰的房间长6m，宽3m，高3.2m．除去门窗6m**2，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">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">6 * 3.2 * 2</gadget>
<output>38.4</output>

<gadget id="calculator">3 * 3.2 * 2</gadget>
<output>19.2</output>

<gadget id="calculator">19.2 - 6</gadget>
<output>13.2</output>

<gadget id="calculator">18 + 38.4 + 13.2</gadget>
<output>69.6</output>

<result>69.6</result>