The school wants to paint the interior walls (surroundings and ceiling) of a classroom. After measurement, the classroom is 8 meters long, 5 meters wide, and 3 meters high. The door and window area is 8.6cm**2. If it costs 15 yuan for paint per square meter, how much will it cost to paint this classroom?
学校要粉刷一间教室的内墙(四周和天花板)，经过测量，教室长8米，宽5米，高3米，门窗面积8.6cm**2．如果每平方米需花15元涂料费，粉刷这间教室涂料费就要花多少元？
<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">24 + 15</gadget>
<output>39</output>

<gadget id="calculator">39 * 2</gadget>
<output>78</output>

<gadget id="calculator">78 - 8.6</gadget>
<output>69.4</output>

<gadget id="calculator">40 + 69.4</gadget>
<output>109.4</output>

<gadget id="calculator">109.4 * 15</gadget>
<output>1_641</output>

<result>1_641</result>