Xiaofang's bedroom is 4.5 meters long, 4 meters wide, and 3 meters high. It is necessary to paste wallpaper on the walls and roof of the bedroom. Excluding doors and windows of 3.5 square meters, how many square meters of wallpaper does this bedroom need at least?
小芳的卧室长4.5米，宽4米，高3米，要给卧室四周墙壁和屋顶贴上墙纸，除去门窗3.5平方米，这个卧室至少要多少平方米的墙纸？
<gadget id="calculator">4.5 * 3</gadget>
<output>13.5</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">13.5 + 12</gadget>
<output>25.5</output>

<gadget id="calculator">25.5 * 2</gadget>
<output>51</output>

<gadget id="calculator">4.5 * 4</gadget>
<output>18</output>

<gadget id="calculator">18 - 3.5</gadget>
<output>14.5</output>

<gadget id="calculator">51 + 14.5</gadget>
<output>65.5</output>

<result>65.5</result>