A cuboid with a square base, the side length of the base is 5 decimeters, and the sides are a square. What is the surface area of the cuboid?
一个底面是正方形的长方体，底面边长为5分米，侧面展开是一个正方形，这个长方体的表面积是多少平方分米？
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">20 * 20</gadget>
<output>400</output>

<gadget id="calculator">5 * 5 * 2</gadget>
<output>50</output>

<gadget id="calculator">400 + 50</gadget>
<output>450</output>

<result>450</result>