in c#

List> arr = new List>();

    for (int i = 0; i < 6; i++)
    {
        arr.Add(Console.ReadLine().TrimEnd()
                    .Split(' ')
                     .ToList()
                     .Select(arrTemp => Convert.ToInt32(arrTemp))
                     .ToList());
    }

   List<List<int>> result = new List<List<int>>();
   int indexNumber=0;
   int lenght_arr=arr[0].Count();

   for(int i=0; i<=3;i++)
   {
       for(int j=0; j<= lenght_arr-3;j++)
       {
          if(result.Count <= indexNumber) 
          {
              result.Insert(indexNumber,new List<int>());
          }

           result[indexNumber].AddRange(arr[i].Skip(j).Take(3).ToList());
           result[indexNumber].AddRange(arr[i+1].Skip(j+1).Take(1).ToList());
           result[indexNumber].AddRange(arr[i+2].Skip(j).Take(3).ToList());

           indexNumber++;
       }

   }

   int maxnumber=result.Select(x=>x.Sum()).Max();

       Console.WriteLine(maxnumber);