import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;

public class Solution {
    static int rowSum[] = new int[n];
     static   int colsum[] = new int[n];
      static  int rowDiff[] = new int[n];
      static  int colDiff[] = new int[n];
      static   boolean f = false;
    // Complete the formingMagicSquare function below.
    static int formingMagicSquare(int[][] s) {
        int n = s.length;
        int sum = n*((n*n) +1)/2;
         f = calcDiff(s);
       while(!f)
       {
        for(int i = 0;i<n;i++)
        {
            for(int j =0;j<n;j++)
            {
                if(rowDiff[i]==colDiff[j])
                {
                    s[i][j] = s[i][j]+rowDiff[i];
                    f = calcDiff(s);
                }
            }
        }
       }
        return s;
        
    }
    
    static boolean calcDiff(int[][] s)
    {
        boolean flag = false;
         for(int i = 0;i<n;i++)
        {
            for(int j = 0;j<n;j++)
            {
                rowsum[i] = rowsum[i]+s[i][j];
                colsum[i] = colsum[i]+s[j][i];
               
            }
        }
        
        for(int i = 0;i<n;i++)
        {
            if(rowsum[i]!=sum)
            {
                rowDiff[i] = rowsum[i] - sum;
                flag = true;
            }
            
             if(colsum[i]!=sum)
             {
                colDiff[i] = colsum[i] - sum;
                 flag = true;
             }
        }
        return flag;
    }

    private static final Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) throws IOException {
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int[][] s = new int[3][3];

        for (int i = 0; i < 3; i++) {
            String[] sRowItems = scanner.nextLine().split(" ");
            scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");

            for (int j = 0; j < 3; j++) {
                int sItem = Integer.parseInt(sRowItems[j]);
                s[i][j] = sItem;
            }
        }

        int result = formingMagicSquare(s[3][3]);

        bufferedWriter.write(String.valueOf(result));
        bufferedWriter.newLine();

        bufferedWriter.close();

        scanner.close();
    }
}