static void Main()
{
int n = Convert.ToInt32(Console.ReadLine());
int[][] grid = new int[n][];
for (int a_i = 0; a_i < n; a_i++)
{
string[] a_temp = Console.ReadLine().Split(' ');
grid[a_i] = Array.ConvertAll(a_temp, Int32.Parse);
}
Solution s = new Solution(grid, n);
s.diagonalDifference();
Console.ReadKey();
}