There is a house (flat roof) with a length of 6 meters, a width of 3.3 meters, and a height of 3 meters. The area of doors and windows is 8 square meters. It is necessary to paint its four walls and top surface. How many square meters is the painted area?
有一间房屋(平顶)，长6米，宽3.3米，高3米，门窗面积是8平方米，要粉刷它的四壁和顶面，粉刷的面积有多少平方米．
<gadget id="calculator">6 * 3.3</gadget>
<output>19.8</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">3.3 * 3</gadget>
<output>9.9</output>

<gadget id="calculator">18 + 9.9</gadget>
<output>27.9</output>

<gadget id="calculator">27.9 * 2</gadget>
<output>55.8</output>

<gadget id="calculator">55.8 - 8</gadget>
<output>47.8</output>

<gadget id="calculator">19.8 + 47.8</gadget>
<output>67.6</output>

<result>67.6</result>