A classroom with a length of 8 meters, a width of 6 meters, and a height of 3 meters needs to be painted on its top and four walls. Excluding the blackboard, doors and windows, the area is 30 square meters. How big is the area to be painted?
一间长8米，宽6米，高3米的教室，要粉刷它的顶部和四壁，除去黑板和门窗面积30平方米，问要粉刷的面积有多大？
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">8 * 3 * 2</gadget>
<output>48</output>

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

<gadget id="calculator">48 + 48 + 36</gadget>
<output>132</output>

<gadget id="calculator">132 - 30</gadget>
<output>102</output>

<result>102</result>