There is no God Summer

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution {

    static void Main(String[] args) {
        int sumOne = 0;
        int sumTwo = 0;
        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);
        }

        for(int i = 0; i < n; i++)
        {
            sumOne+=a[i][i];
            int ix = n;
            if(i == 0)
                ix--;
            else
                ix = ix - (i + 1);

            sumTwo+=a[i][ix];
        }

        int diffTotal = 0;

        diffTotal = (sumOne - sumTwo);

        if (diffTotal < 0)
            diffTotal*=-1;

        Console.WriteLine(diffTotal);
    }
}