using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution */
                    int[,] arrOrig = new int[3,3];
            int[,] arr = new int[3, 3];

            for (int i = 0; i < 3; i++)
            {
                string[] height_temp = Console.ReadLine().Split(' ');
                int[] height = Array.ConvertAll(height_temp, Int32.Parse);

                arrOrig[i,0] = height[0];
                arrOrig[i,1] = height[1];
                arrOrig[i,2] = height[2];
            }

            int min = 10;

            arr = arrOrig;
            if (isMagic(arr))
            {
                if ((arr[0, 0] + arr[0, 1] + arr[0, 2]) < min)
                {
                    min = (arr[0, 0] + arr[0, 1] + arr[0, 2]);
                }
            }

            for (int i = 0; i < 3; i++)
            {
                for (int ii = 0; ii < 3; ii++)
                {
                    arr = arrOrig;
                    arr[i, ii]++;

                    if ( isMagic(arr) )
                    {
                        if ((arr[0,0] + arr[0,1] + arr[0,2]) < min)
                        {
                            min = (arr[0,0] + arr[0,1] + arr[0,2]);
                        }
                    }
                }
            }
            Console.WriteLine(min);
    }
}