public static void Main()
Console.WriteLine(CalculateHourGlass(a));
static int CalculateHourGlass(int[,] a)
for (int i=0; i < 6; i++)
int hourGlass = a[i,j] + a[i,j+1] + a[i,j+2] + a[i+1,j+1] + a[i+2,j] + a[i+2,j+1] + a[i+2, j+2];
if (hourGlass > maxHourGlass)
maxHourGlass = hourGlass;