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

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner sc = new Scanner(System.in);
        int number[][]=new int[3][3];
        int i,j;
        for(i=0;i<=2;i++)
        {
            for(j=0;j<=2;j++)
            {
                number[i][j]=sc.nextInt();
            }
        }
        int count[] = new int [8];
        count[0] = number[0][0]+number[0][1]+number[0][2];
        count[1] = number[1][0]+number[1][1]+number[1][2];
        count[2] = number[2][0]+number[2][1]+number[2][2];
        count[3] = number[0][0]+number[1][0]+number[2][0];
        count[4] = number[0][1]+number[1][1]+number[2][1];
        count[5] = number[0][2]+number[1][2]+number[2][2];
        count[6] = number[0][0]+number[1][1]+number[2][2];
        count[7] = number[0][2]+number[1][1]+number[2][0];
        int sumCount =0;
        
        for( i=0;i<8;i++){
            if(count[i]!=15){
                ++sumCount;
            } 
        }
        if(sumCount>0){
            Arrays.sort(count);
            System.out.println(count[7]-count[0]);
            
        }
        
    }
}