Blur Filter

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BlurFilter
{
    class Program
    {
        static void Main(string[] args)
        {
            int blur_amount = int.Parse(Console.ReadLine());
            int[] d = Array.ConvertAll(Console.ReadLine().Split(' '), s => int.Parse(s));
            var matrix = new int[d[0], d[1]];

            for (var i = 0; i < d[0]; i++)
            {
                var line = Console.ReadLine();
                var spl = line.Split(' ');
                if (spl.Length != d[1]) {
                    throw new FormatException();
                }
                for (var j = 0; j < d[1]; j++)
                    matrix[i, j] = int.Parse(spl[j]);
            }

            var coords = Console.ReadLine().Split(' ');
            if (coords.Length != 2) {
                throw new FormatException();
            }

            matrix = DoTheMath(matrix, coords, blur_amount);
            GetStatus(matrix);
        }

        public static int[,] DoTheMath(int[,] matrix, string[] coords, int blur_amount)
        {
            for (int row = 0; row < matrix.GetLength(0); row++)
            {
                for (int col = 0; col < matrix.GetLength(1); col++)
                {
                    if (row == int.Parse(coords[0]) && col == int.Parse(coords[1]))
                    {
                        matrix[row, col] += blur_amount;
                        matrix[row, col - 1] += blur_amount;
                        matrix[row - 1, col - 1] += blur_amount;
                        matrix[row - 1, col] += blur_amount;
                        matrix[row - 1, col + 1] += blur_amount;
                        matrix[row, col + 1] += blur_amount;
                        matrix[row + 1, col + 1] += blur_amount;
                        matrix[row + 1, col] += blur_amount;
                        matrix[row + 1, col - 1] += blur_amount;
                    }

                }
            }
            return matrix;
        }

        public static void GetStatus(int[,] matrix) {

            for (int i = 0; i < matrix.GetLength(0); i++)
            {
                for (int a = 0; a < matrix.GetLength(1); a++)
                {
                    Console.Write("{0} ", matrix[i, a]);
                }
                Console.WriteLine();
            }

        }
    }
}