To make a cuboid tin bucket without a cover, the bottom is a square with a side length of 4 decimeters and a height of 5 decimeters. How many square decimeters of iron is needed to make this bucket?
做一个无盖的长方体铁皮水桶，底面是边长为4分米的正方形，高5分米，做这个水桶至少需要多少平方分米的铁皮？
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">4 * 5 * 4</gadget>
<output>80</output>

<gadget id="calculator">16 + 80</gadget>
<output>96</output>

<result>96</result>