A classroom is 8m long, 5m wide, and 3.6m high. The ceiling and four walls of the classroom are to be painted, and the area of doors, windows and blackboards is 15.6m**2. How many square meters is the area to be painted?
一间教室长8m，宽5m，高3.6m．要粉刷教室的天花板和四面墙壁，除去门窗和黑板面积15.6m**2，要粉刷的面积是多少平方米？
<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">8 * 3.6</gadget>
<output>28.8</output>

<gadget id="calculator">5 * 3.6</gadget>
<output>18</output>

<gadget id="calculator">28.8 + 18</gadget>
<output>46.8</output>

<gadget id="calculator">46.8 * 2</gadget>
<output>93.6</output>

<gadget id="calculator">93.6 - 15.6</gadget>
<output>78</output>

<gadget id="calculator">40 + 78</gadget>
<output>118</output>

<result>118</result>