using System;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        int[,] m = new int[6, 6];

        for (int i = 0; i < 6; i++)
        {
            int[] temp = Console.ReadLine().Split().Select(int.Parse).ToArray();
            for (int j = 0; j < 6; j++)
            {
                m[i, j] = temp[j];
            }
        }

        int maxSum = int.MinValue;

        for (int i = 0; i < 4; i++)
        {
            for (int j = 0; j < 4; j++)
            {
                int currentSum = 0;
                int currentR = i;
                int currentC = j;
                for (int k = i; k < i + 3; k++)
                {
                    for (int l = j; l < j + 3; l++)
                    {
                        currentSum += m[k, l];
                    }
                }
                currentSum -= m[i + 1, j];
                currentSum -= m[i + 1, j + 2];
                if (currentSum > maxSum) { maxSum = currentSum; }
            }
        }

        Console.WriteLine(maxSum);
    }
}