The lecture hall is 18m long, 12m wide, and 3.3m high. Wallpapers should be pasted around and on the roof, and the area of doors and windows is 23m**2. If the wallpaper is 2.3 yuan per square meter. How much does it cost in total?
报告厅长18m，宽12m，高3.3m，要在四周和屋顶贴上壁纸，扣除门窗面积23m**2，如果每平方米壁纸2.3元．一共需要多少元？
<gadget id="calculator">18 * 12</gadget>
<output>216</output>

<gadget id="calculator">18 * 3.3</gadget>
<output>59.4</output>

<gadget id="calculator">12 * 3.3</gadget>
<output>39.6</output>

<gadget id="calculator">59.4 + 39.6</gadget>
<output>99</output>

<gadget id="calculator">99 * 2</gadget>
<output>198</output>

<gadget id="calculator">198 - 23</gadget>
<output>175</output>

<gadget id="calculator">216 + 175</gadget>
<output>391</output>

<gadget id="calculator">391 * 2.3</gadget>
<output>899.3</output>

<result>899.3</result>