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 sc=new Scanner(System.in);
        int s[][]=new int[3][3];
        for(int i=0;i<3;i++)
            for(int j=0;j<3;j++)
            s[i][j]=sc.nextInt();
        int cost = Integer.MAX_VALUE;
    int temp = 0;
        int total;
    
        total=s[0][0]+s[1][0]+s[2][0];
    
    for (int i = 0; i < 3; i++) {
        temp = 0;
        for (int j = 0; j < 3; j++) {
            temp += s[i][j];
        }
        if((Math.abs(total - temp)) < cost){
            cost = Math.abs(total - temp);
        }
    }
    System.out.println(cost+1);
    }
}