import java.util.*;

public class Solution {
    static int[] matrix = new int[9];
    static int[][] perfects = {
        {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},
        {6,7,2,1,5,9,8,3,4},
        {8,1,6,3,5,7,4,9,2},
        {4,3,8,9,5,1,2,7,6}   
    };

    public static void main(String[] args) {
        
        Scanner in = new Scanner(System.in);
     
        for(int i = 0; i < 9; i++){
            matrix[i] = in.nextInt();
        }
    
        int min = Integer.MAX_VALUE;
        int diff;
        for(int i = 0; i < 8; i++){
            diff = difference(matrix,perfects[i]);
            min = Math.min(min,diff);
        }
        System.out.println(min);
    }
    
    public static int difference(int[] a, int[] b){
        int sum = 0;
        for(int i = 0; i < 9; i++){
            sum+= Math.abs(a[i]-b[i]);
        }
        return sum;
    }
}