Školjka On a square table of 
by cells we place a finite number of napkins that each cover a square of 
by cells. In each cell we write the number of napkins covering it, and we record the maximal number 
of cells that all contain the same nonzero number. Considering all possible napkin configurations, what is the largest value of ?
Proposed by Ilya Bogdanov and Rustem Zhenodarov, Russia
by cells we place a finite number of napkins that each cover a square of by cells. In each cell we write the number of napkins covering it, and we record the maximal number of cells that all contain the same nonzero number. Considering all possible napkin configurations, what is the largest value of ?Proposed by Ilya Bogdanov and Rustem Zhenodarov, Russia