A classroom is 10 meters long, 6 meters wide, and 3 meters high. The classroom doors, windows and blackboards have a total area of 36 square meters. If the top surface and surrounding walls of the classroom are to be painted, how many square meters is the painted area?
一间教室长10米，宽6米，高3米，教室门窗和黑板的面积一共有36平方米，要粉刷教室的顶面和四周墙壁，粉刷的面积有多少平方米？
<gadget id="calculator">10 * 6</gadget>
<output>60</output>

<gadget id="calculator">10 * 3 * 2</gadget>
<output>60</output>

<gadget id="calculator">6 * 3 * 2</gadget>
<output>36</output>

<gadget id="calculator">36 - 36</gadget>
<output>0</output>

<gadget id="calculator">60 + 60 + 0</gadget>
<output>120</output>

<result>120</result>