A cuboid glass fish tank (there is no glass on the top of the fish tank), 5 decimeters long, 3 decimeters wide, and 4 decimeters high, how many square decimeters of glass is needed to make this fish tank at least?
一个长方体玻璃鱼缸(鱼缸的上面没有玻璃)，长5分米，宽3分米，高4分米制作这个鱼缸至少需要多少平方分米的玻璃？
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">20 + 12</gadget>
<output>32</output>

<gadget id="calculator">32 * 2</gadget>
<output>64</output>

<gadget id="calculator">15 + 64</gadget>
<output>79</output>

<result>79</result>