using System;

public class Program

{

    public static void Main()

    {   

     int[,] matrix = { {1, 2, 3}, 

                      {4, 5, 6}, 

                      {7, 8, 9}};

            int no1 = matrix[0,2];

           int no2 =    matrix[1,1];

            int no3 = matrix[2,0];

            Console.WriteLine("The sum of diagonal elements = " +(no1+no2+no3));

​

    }}