The school plans to paint the multi-functional classroom. The classroom is 15m long, 10m wide, and 4.5m high. The total area of doors, windows and blackboards is 24m**2. Now to paint the surrounding walls and ceiling. Approximately how many square meters do you need to paint?
学校计划对多功能教室进行粉刷，教室长为15m，宽为10m，高为4.5m，门、窗、黑板面积总共为24m**2．现要粉刷四周墙壁和天花板．大约需要粉刷多少平方米？
<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<gadget id="calculator">15 * 4.5 * 2</gadget>
<output>135</output>

<gadget id="calculator">10 * 4.5 * 2</gadget>
<output>90</output>

<gadget id="calculator">90 - 24</gadget>
<output>66</output>

<gadget id="calculator">150 + 135 + 66</gadget>
<output>351</output>

<result>351</result>