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) {
        Scanner in = new Scanner(System.in);
        int[][] array = new int[3][3];
        int[] sums = new int[8];
        
        for(int i = 0; i < 3; i++){
            for(int y = 0; y < 3; y++){
                array[i][y] =  in.nextInt();
            }
        }
        
        sums[0] = array[0][0] + array[0][1] + array[0][2];
        sums[1] = array[1][0] + array[1][1] + array[1][2];
        sums[2] = array[2][0] + array[2][1] + array[2][2];
        
        sums[3] = array[0][0] + array[1][0] + array[2][0];
        sums[4] = array[0][1] + array[1][1] + array[2][1];
        sums[5] = array[0][2] + array[1][2] + array[2][2];
        
        sums[6] = array[0][0] + array[1][1] + array[2][2];
        sums[7] = array[0][2] + array[1][1] + array[2][0];
        
        int max = 0;
        for(int i = 0; i < 8; i++){
            if(sums[i] < 15 && sums[i] > max) max = sums[i];
        }
        
        System.out.println(15 - max);
    }
}