using System;
public class Exercise23
{
    public static void Main()

    {
        int i,j,sum=0,n;
        int[,] arr1 = new int[50,50];
        Console.Write("\n\nFind sum of right diagonals of a matrix :\n");
        Console.Write("---------------------------------------\n");
        Console.Write("Input the size of the square matrix : ");
        n=Convert.ToInt32(Console.ReadLine());
        Console.Write("Input elements in the first matrix :\n");
        for(i=0; i<n; i++)
            {
                for(j=0; j<n; j++)
                    {
                        Console.Write("element - [{0}],[{1}] : ",i,j);
                        arr1[i,j]=Convert.ToInt32(Console.ReadLine());
                        if (i==j) sum= sum+arr1[i,j];
                    }
            }
        Console.Write("The matrix is :\n");
        for(i=0; i<n; i++)
            {
                for(j=0; j<n ; j++)
                    Console.Write("{0} ",arr1[i,j]);
                Console.Write("\n");
            }
        Console.Write("Addition of the right Diagonal elements is :{0}\n",sum);
    }
}