import java.io.*;
import java.util.*;

public class MagicSquare { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int[] a=new int[9];

    for(int i=0;i<9;i++){
            a[i]=sc.nextInt();
        }
    ArrayList arrayList=new ArrayList();
    int [][] squares={
            {6, 1, 8, 7, 5, 3, 2, 9, 4},
            {8, 1, 6, 3, 5, 7, 4, 9, 2},
            {8, 3, 4, 1, 5, 9, 6, 7, 2},
            {6, 7, 2, 1, 5, 9, 8, 3, 4},
            {2, 7, 6, 9, 5, 1, 4, 3, 8},
            {4, 3, 8, 9, 5, 1, 2, 7, 6},
            {4, 9, 2, 3, 5, 7, 8, 1, 6},
            {2, 9, 4, 7, 5, 3, 6, 1, 8}
    };

int minChange=0;
for(int i=0;i<8;i++){
    for(int j=0;j<9;j++){
    minChange+=Math.abs(a[j]-squares[i][j]);
}
    //System.out.println(minChange);
    arrayList.add(minChange);
    minChange=0;
}
    Collections.sort(arrayList);
    System.out.println(arrayList.get(0));
}

}