Diagonal Difference, C#

Diagonal Difference

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
        int n = Convert.ToInt32(Console.ReadLine());
        int[][] a = new int[n][];
        for(int a_i = 0; a_i < n; a_i++){
           string[] a_temp = Console.ReadLine().Split(' ');
           a[a_i] = Array.ConvertAll(a_temp,Int32.Parse);
        }
        
        int primaryD = 0;
        int secD = 0;
        for(int i=0; i<n; i++){            
           int j= n-i-1;       
            primaryD +=a[i][i];                    
            secD +=a[i][j];
                
           
        }     
     
            int result = Math.Abs((primaryD - secD));
             Console.WriteLine(result);
        }
    }
}


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