Xiaojun's room is 5 meters long, 4 meters wide, and 3 meters high from the inside. Now the roof and surrounding walls (excluding doors and windows) need to be painted. How many square meters is the area to be painted?
小军家的房间从里面量长5米，宽4米，高3米，现在要粉刷屋顶和四周墙壁(门窗不计)．要粉刷的面积是多少平方米？
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">5 * 3 * 2</gadget>
<output>30</output>

<gadget id="calculator">4 * 3 * 2</gadget>
<output>24</output>

<gadget id="calculator">20 + 30 + 24</gadget>
<output>74</output>

<result>74</result>