The length of a room is 15 meters, the width is 8 meters, the height is 40 decimeters, and the area of doors and windows is 10 square meters. Now we need to paint the walls and roof of this room with cement. If 4 kilograms of cement is needed per square meter, how many kilograms of cement will be needed in total?
一个房间的长15米，宽8米，高40分米，门窗面积是10平方米．现在要把这个房间的四壁和顶面粉刷水泥，如果每平方米需要水泥4千克，一共要水泥多少千克？
<gadget id="calculator">15 * 8</gadget>
<output>120</output>

<gadget id="calculator">40 / 10</gadget>
<output>4</output>

<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">60 + 32</gadget>
<output>92</output>

<gadget id="calculator">92 * 2</gadget>
<output>184</output>

<gadget id="calculator">184 - 10</gadget>
<output>174</output>

<gadget id="calculator">120 + 174</gadget>
<output>294</output>

<gadget id="calculator">294 * 4</gadget>
<output>1_176</output>

<result>1_176</result>