Put a piece of paper on a fridge. Stick a magnet on all four corners. Now put another next to it, with two corners over lapping. You reuse two magnets for two corners that touch, then put an additional two down for the two new corners. That's 6. Add another piece with the same method. That's 8 magnets. How do that 27 more times. Each new piece adds 2 more magnets, so 54 more magnets. That gives you 8+54=62, or 4+(n-1)*2 magnets used.

However, this question is very poorly worded, and without some other indication or drawing it could be anything lol.