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 scanner = new Scanner(System.in);
        int[][] arr = new int[3][3];
        int row_diff= 0;
        int col_sum=0;
        int row=0;
        int col=0;
        int j=0;
        for(int i=0;i<3;i++)
            {
            int row_sum = 0;
            for(j=0;j<3;j++)
            {
                arr[i][j] = scanner.nextInt();
                row_sum += arr[i][j];
               // col_sum += arr[j][i];
                
                    
            }
            if(row_sum<15){
                    row = i;
                    row_diff = row_sum;
                     int diff = 15- row_diff;
                    System.out.println(diff);
                    return;
                }
        }
    }
}