using System;

namespace MATRIX
{
    class Program
    {
        static void Main(string[] args)
        {
            int[][] matrix =
            {
                new int[] {1, 2, 4, 7 },
                new int[] {3, 5, 8, 10 },
                new int[] {6, 9 , 11, 12 }
            };

            var temp = -1;

            for (int i = 0; i < matrix[0].Length; i++)
            {
                var row = 0;
                temp++;
                var col = temp;

                while (true)
                {
                    if (row == 0 && col == 0)
                    {
                        Console.WriteLine(matrix[row][col]);
                        break;
                    }
                    Console.WriteLine(matrix[row][col]);

                    col--;
                    row++;

                    if (row == matrix.Length || col < 0)
                    {
                        break;
                    }
                }
            }

            var colum = matrix[1].Length - 1;
            temp = 1;
            var rows = 1;

            for (int i = 1; i <= matrix.Length; i++)
            {
                Console.WriteLine(matrix[rows][colum]);
                colum--;
                if (rows == matrix.Length - 1)
                {
                    rows = temp;
                    temp++;
                    colum = matrix[1].Length - 1;
                }
                rows++;
            }
        }
    }
}