The corridor of a hotel is 28 meters long, 8 meters wide, and 3.5 meters high. There are 16 doors on both sides of the corridor, and the area of each door is 2.5 square meters. Now we need to paste wallpaper on the walls on both sides of the corridor, with an average of 1.5 square meters of wallpaper per square meter and the rest of the unpasted area is 25 square meters. What is the minimum area on both sides of the corridor that needs to be wallpapered?
一家宾馆的走廊，长28米，宽8米，高3.5米，走廊两边共有16扇门，每扇门的面积是2.5平方米．现要给走廊两边墙贴壁纸，平均每平方米用壁纸1.5平方米其余不贴的面积25平方米，走廊两边至少有多大面积需要贴壁纸？
<gadget id="calculator">28 * 3.5 * 2</gadget>
<output>196</output>

<gadget id="calculator">2.5 * 16</gadget>
<output>40</output>

<gadget id="calculator">196 - 40 - 25</gadget>
<output>131</output>

<result>131</result>