classroom is 9 meters long, 6 meters wide, and 4 meters high. The roof and walls need to be painted, and the area of doors, windows and blackboards is 26 square meters. If 2.3 kilograms of paint is used per square meter, how many kilograms of paint are needed to paint the classroom? ?
一间教室长9米，宽6米，高4米，要粉刷房顶和四壁，扣除门窗和黑板面积共26平方米，若每平方米用涂料2.3千克，粉刷这间教室需要涂料多少千克？
<gadget id="calculator">9 * 6</gadget>
<output>54</output>

<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">36 + 24</gadget>
<output>60</output>

<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<gadget id="calculator">120 - 26</gadget>
<output>94</output>

<gadget id="calculator">54 + 94</gadget>
<output>148</output>

<gadget id="calculator">148 * 2.3</gadget>
<output>340.4</output>

<result>340.4</result>