A room is 5 meters long, 4 meters wide, and 3 meters high. If you paste wallpaper on the four walls of the room, excluding doors and windows of 7 square meters, the wallpaper is 12.5 yuan per square meter. How much is the wallpaper in total?
一个房间长5米，宽4米，高3米，如果在房间四壁贴墙纸，除去门窗7平方米，每平方米墙纸12.5元，共要多少元的墙纸？
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

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

<gadget id="calculator">15 + 12</gadget>
<output>27</output>

<gadget id="calculator">27 * 2</gadget>
<output>54</output>

<gadget id="calculator">54 - 7</gadget>
<output>47</output>

<gadget id="calculator">12.5 * 47</gadget>
<output>587.5</output>

<result>587.5</result>