int[] sizes = Console.ReadLine()
                .Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
                .Select(int.Parse)
                .ToArray();

            int[][] rubik = new int[sizes[0]][];

            int counter = 1;

            for (int row = 0; row < rubik.Length; row++)
            {
                rubik[row] = new int[sizes[1]];

                for (int col = 0; col < sizes[1]; col++)
                {
                    rubik[row][col] = counter;
                    counter++;
                }
            }