import java.io.*;
import java.util.*;
class MyScanner {
    BufferedReader br;
    StringTokenizer st;
 
    public MyScanner() {
        br = new BufferedReader(new InputStreamReader(System.in));
    }
 
    String next() {
        while (st == null || !st.hasMoreElements()) {
            try {
                st = new StringTokenizer(br.readLine());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return st.nextToken();
    }
 
    int nextInt() {
        return Integer.parseInt(next());
    }
 
    long nextLong() {
        return Long.parseLong(next());
    }
 
    double nextDouble() {
        return Double.parseDouble(next());
    }
 
    String nextLine(){
        String str = "";
        try {
            str = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str;
    }
}
public class Solution {

    public static void main(String[] args) {
         MyScanner input = new MyScanner();
         int matrix[][] = new int[3][3];
         for(int i = 0; i < 3; i++)
             for(int j = 0; j < 3; j++)
                matrix[i][j] = input.nextInt();
             int magic[][][] = {{{4,9,2},{3,5,7},{8,1,6}},{{8,3,4},{1,5,9},{6,7,2}}
                                ,{{6,1,8},{7,5,3},{2,9,4}},{{2,7,6},{9,5,1},{4,3,8}}
                                ,{{2,9,4},{7,5,3},{6,1,8}},{{4,3,8},{9,5,1},{2,7,6}}
                                ,{{8,1,6},{3,5,7},{4,9,2}},{{6,7,2},{1,5,9},{8,3,4}}};
        int min = 999;
        for(int i = 0; i < 8; i++){
            int count = 0;
            for(int j = 0; j < 3; j ++)
                for(int k = 0; k < 3; k++)
                    count += Math.abs(magic[i][j][k] - matrix[j][k]);
        if(count < min)
                min = count;
        }
        System.out.println(min);
    }
}