Give a cuboid water tank with a length of 0.5 meters, a width of 0.3 meters, and a height of 0.4 meters, and tile the inside and outside of it. (The side on the ground is not pasted, and the thickness of the water tank is not counted.) Please calculate the area of the tiles used in the water tank?
给一个长0.5米，宽0.3米，高为0.4米的长方体水箱里外，贴瓷砖，(着地的一面不贴，水箱厚度不计)请你计算水箱所所用瓷砖的面积？
<gadget id="calculator">0.5 * 0.3</gadget>
<output>0.15</output>

<gadget id="calculator">0.5 * 0.4 * 2</gadget>
<output>0.4</output>

<gadget id="calculator">0.3 * 0.4 * 2</gadget>
<output>0.24</output>

<gadget id="calculator">0.15 + 0.4 + 0.24</gadget>
<output>0.79</output>

<gadget id="calculator">0.79 * 2</gadget>
<output>1.58</output>

<result>1.58</result>