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. */
        
        int[][] ms1 = new int[3][3];
        int[][] ms2 = new int[3][3];
        int[][] ms3 = new int[3][3];
        int[][] ms4 = new int[3][3];
        int[][] ms5 = new int[3][3];
        int[][] ms6 = new int[3][3];
        int[][] ms7 = new int[3][3];
        int[][] ms8 = new int[3][3];
        int[][] ms9 = new int[3][3];
        
        ms1[0][0] = 4;
        ms1[0][1] = 9;
        ms1[0][2] = 2;
        
        ms1[1][0] = 3;
        ms1[1][1] = 5;
        ms1[1][2] = 7;
        
        ms1[2][0] = 8;
        ms1[2][1] = 1;
        ms1[2][2] = 6;
        
        ms2[0][0] = 2;
        ms2[0][1] = 7;
        ms2[0][2] = 6;
        
        ms2[1][0] = 9;
        ms2[1][1] = 5;
        ms2[1][2] = 1;
        
        ms2[2][0] = 4;
        ms2[2][1] = 3;
        ms2[2][2] = 8;
        
        
        ms3[0][0] = 6;
        ms3[0][1] = 1;
        ms3[0][2] = 8;
        
        ms3[1][0] = 7;
        ms3[1][1] = 5;
        ms3[1][2] = 3;
        
        ms3[2][0] = 2;
        ms3[2][1] = 9;
        ms3[2][2] = 4;
        
        
        ms4[0][0] = 8;
        ms4[0][1] = 3;
        ms4[0][2] = 4;
        
        ms4[1][0] = 1;
        ms4[1][1] = 5;
        ms4[1][2] = 9;
        
        ms4[2][0] = 6;
        ms4[2][1] = 7;
        ms4[2][2] = 2;
        
        
        ms5[0][0] = 2;
        ms5[0][1] = 9;
        ms5[0][2] = 4;
        
        ms5[1][0] = 7;
        ms5[1][1] = 5;
        ms5[1][2] = 3;
        
        ms5[2][0] = 6;
        ms5[2][1] = 1;
        ms5[2][2] = 8;
        
        
        ms6[0][0] = 6;
        ms6[0][1] = 7;
        ms6[0][2] = 2;
        
        ms6[1][0] = 1;
        ms6[1][1] = 5;
        ms6[1][2] = 9;
        
        ms6[2][0] = 8;
        ms6[2][1] = 3;
        ms6[2][2] = 4;
        
        
        ms7[0][0] = 8;
        ms7[0][1] = 1;
        ms7[0][2] = 6;
        
        ms7[1][0] = 3;
        ms7[1][1] = 5;
        ms7[1][2] = 7;
        
        ms7[2][0] = 4;
        ms7[2][1] = 9;
        ms7[2][2] = 2;
        
        
        ms8[0][0] = 4;
        ms8[0][1] = 3;
        ms8[0][2] = 8;
        
        ms8[1][0] = 9;
        ms8[1][1] = 5;
        ms8[1][2] = 1;
        
        ms8[2][0] = 2;
        ms8[2][1] = 7;
        ms8[2][2] = 6;
        
        Scanner in = new Scanner(System.in);
        int[][] square = new int[3][3];
        for(int i = 0; i < 3; i++) {
            for(int j = 0; j < 3; j++) {
                square[i][j] = in.nextInt();
            }
        }
        
        int sum1 = 0;
        int sum2 = 0;
        int sum3 = 0;
        int sum4 = 0;
        int sum5 = 0;
        int sum6 = 0;
        int sum7 = 0;
        int sum8 = 0;
        for(int n = 0; n < 3; n++){
            for(int m = 0; m < 3; m++){
                sum1 += Math.abs(square[n][m] - ms1[n][m]);
                sum2 += Math.abs(square[n][m] - ms2[n][m]);
                sum3 += Math.abs(square[n][m] - ms3[n][m]);
                sum4 += Math.abs(square[n][m] - ms4[n][m]);
                sum5 += Math.abs(square[n][m] - ms5[n][m]);
                sum6 += Math.abs(square[n][m] - ms6[n][m]);
                sum7 += Math.abs(square[n][m] - ms7[n][m]);
                sum8 += Math.abs(square[n][m] - ms8[n][m]);
                
            }
        }
        int min = 1000000;
        int[] arr = {sum1,sum2,sum3,sum4,sum5,sum6,sum7,sum8};
        for(int x = 0; x < arr.length;x++){
            if(arr[x] < min)
                min = arr[x];
        }
        System.out.println(min);
    }
}