A glass fish tank is in the shape of a cuboid, with a length of 5 decimeters, a width of 4 decimeters, and a height of 3 decimeters. How many square decimeters of glass are needed to make this fish tank?
一个玻璃鱼缸的形状是长方体，长5分米，宽4分米，高3分米，制作这个鱼缸时至少需要多少平方分米的玻璃？
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

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

<gadget id="calculator">15 + 12</gadget>
<output>27</output>

<gadget id="calculator">27 * 2</gadget>
<output>54</output>

<gadget id="calculator">20 + 54</gadget>
<output>74</output>

<result>74</result>