The living room of Xiaoming’s house is in the shape of a cuboid, 8 meters long, 6 meters wide, and 2.8 meters high. To paste wallpaper on the walls around the living room (the total area of doors and windows is 12 square meters), at least how many square meters of wallpaper should be used?
小明家客厅的形状是一个长方体，长8米，宽6米，高2.8米．要在客厅四面的墙上贴墙纸(门窗总面积是12平方米)，至少要用墙纸多少平方米？
<gadget id="calculator">8 * 2.8</gadget>
<output>22.4</output>

<gadget id="calculator">6 * 2.8</gadget>
<output>16.8</output>

<gadget id="calculator">22.4 + 16.8</gadget>
<output>39.2</output>

<gadget id="calculator">39.2 * 2</gadget>
<output>78.4</output>

<gadget id="calculator">78.4 - 12</gadget>
<output>66.4</output>

<result>66.4</result>