Xiaoming's living room is in the shape of a cuboid, 8 meters long, 4 meters wide, and 3.5 meters high. To paste wallpaper on the walls around the living room (the total area of doors and windows is 14 square meters), at least how many square meters of wallpaper is needed?
小明家的客厅形状是一个长方体，长8米，宽4米，高3.5米．要在客厅四周的墙上贴墙纸(门窗总面积是14平方米)，至少需要墙纸多少平方米？
<gadget id="calculator">8 * 3.5</gadget>
<output>28</output>

<gadget id="calculator">4 * 3.5</gadget>
<output>14</output>

<gadget id="calculator">28 + 14</gadget>
<output>42</output>

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

<gadget id="calculator">84 - 14</gadget>
<output>70</output>

<result>70</result>