Problem 3. Piglet Naaf-Naaf came up with a way to build a parallelepiped from identical cubes and cover it with three squares without gaps or overlaps. Do this yourself. $\quad[5$ points] (A. V. Shapovalov)
Answer. For example, he can stack a tower of four cubes, "fold" it into a $4 \times 4$ square, and glue the bottom and top with $1 \times 1$ squares.

![](https://cdn.mathpix.com/cropped/2024_05_06_e514393ca180e6b2092dg-03.jpg?height=288&width=115&top_left_y=1339&top_left_x=1210)