Paint a room with a length of 5m, a width of 4m, and a height of 3m. The area of doors and windows is 8m**2. What is the area to be painted in m**2?
粉刷一间长5m，宽4m，高3m的房间，门窗面积是8m**2，要粉刷的面积是多少m**2．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

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

<gadget id="calculator">20 + 12 + 15</gadget>
<output>47</output>

<gadget id="calculator">47 * 2</gadget>
<output>94</output>

<gadget id="calculator">94 - 20 - 8</gadget>
<output>66</output>

<result>66</result>