In a cube with a side length of 50 cm, a small cube with a side length of 5 cm is cut out from each of its eight corners. What is the surface area of the remaining three-dimensional figure?
在一个棱长为50厘米的正方体木块，在它的八个角上各挖去一个棱长为5厘米的小正方体，问剩下的立体图形的表面积是多少．
<gadget id="calculator">50 * 50 * 6</gadget>
<output>15_000</output>

<result>15_000</result>