using System;
using System.Linq;

namespace ArrayStuff
{
    class Program
    {
        static void Main(string[] args)
        {
            var arr = new int[6][]
            {
               new []{1,1,1,0,0,0},
               new []{0,1,0,0,0,0},
               new []{1,1,1,0,0,0},
               new []{0,0,-2,4,-4,0},
               new []{0,0,0,2,0,0},
               new []{0,0,1,2,4,0}
            };
            var result = hourglassSum(arr);
            Console.WriteLine(result);
            Console.ReadLine();
        }


        static int hourglassSum(int[][] arr)
        {
            int winningAddition = 0;
            for (int i = 0; i <= 3; i++)
            {
                for (int j = 0; j <= 3; j++)
                {
                    var topHourglass = GetTopHourGlass(arr,i,j);
                    var middleHourglass = arr[i + 1][j + 1];
                    var bottomHourglass = GetBottomHourGlass(arr,i,j);

                    var result = topHourglass.Sum() + middleHourglass + bottomHourglass.Sum();
                    if (result > winningAddition)
                    {
                        winningAddition = result;
                    }
                }
            }

            return winningAddition;

        }

        private static int[] GetBottomHourGlass(int[][] arr, int i, int j)
        {
           // i +2 j +2

           var newArray = arr[i +2].Skip(j).Take(3).ToArray();
           return  newArray;

        }

        private static int[] GetTopHourGlass(int[][] arr,int i,int j)
        {
            var newArray = arr[i].Skip(j).Take(3).ToArray();

            return  newArray;
        }
    }
}