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 sy=new Scanner(System.in);
        int[] s= new int[9];
        int a[][]={{8,1,6,3,5,7,4,9,2},{6,1,8,7,5,3,2,9,4},{4,9,2,3,5,7,8,1,6},{2,9,4,7,5,3,6,1,8},{8,3,4,1,5,9,6,7,2},{4,3,8,9,5,1,2,7,6},{6,7,2,1,5,9,8,3,4},{2,7,6,9,5,1,4,3,8}};
        int mincost=Integer.MAX_VALUE;
        for(int i=0;i<9;i++)
            s[i]=sy.nextInt();
        for(int i=0;i<8;i++){
            int cost=0;
            for(int j=0;j<9;j++)
                if (s[j]!=a[i][j]){
                    cost+=Math.abs(s[j]-a[i][j]);
                }
            if (cost<mincost)
                mincost=cost;
        }
        System.out.println(mincost);
    }
}