using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        
        string row1 = Console.ReadLine().Replace(" ", "");
        string row2 = Console.ReadLine().Replace(" ", "");
        string row3 = Console.ReadLine().Replace(" ", "");
        
        int[,] matrix = new int[3, 3];
        
        string currentRow = null;
        
        for(int i = 0; i < 3; i++) {
            
            if(currentRow == null) {
                
                currentRow = row1;
            }
            else if(currentRow == row1) {
                
                currentRow = row2;
            }
            else {
                
                currentRow = row3;
            }
            
            for (int j = 0; j < 3; j++) {
                
                
                matrix[i,j] = int.Parse(currentRow[j].ToString());
                
            }
        }
        
        int test1 = matrix[0,0] + matrix[0,1] + matrix[0,2];
        int test2 = matrix[0,0] + matrix[1,0] + matrix[2,0];
        int test3 = matrix[2,0] + matrix[2,1] + matrix[2,2];
        int test4 = matrix[2,2] + matrix[1,2] + matrix[0,2];
        int test5 = matrix[0,1] + matrix[1,1] + matrix[2,1];
        int test6 = matrix[1,0] + matrix[1,1] + matrix[1,2];
        int test7 = matrix[0,0] + matrix[1,1] + matrix[2,2];
        int test8 = matrix[2,0] + matrix[1,1] + matrix[0,2];
       
        
        int smallest = 999;
        
        if(test1 != 15) {
            
            
            int cost = Math.Abs(test1 - 15);
            
            if(cost < smallest) {
                
                smallest = cost;
            }
        }
        
        if(test2 != 15) {
            
            int cost = Math.Abs(test2 - 15);
            
            if(cost < smallest) {
                
                smallest = cost;
            }
        }
        
        if(test3 != 15) {
            
            int cost = Math.Abs(test3 - 15);
            
            if(cost < smallest) {
                
                smallest = cost;
            }
        }
        
        if(test4 != 15) {
            
            int cost = Math.Abs(test4 - 15);
            
            if(cost < smallest) {
                
                smallest = cost;
            }
        }
        
        if(test5 != 15) {
            
            int cost = Math.Abs(test5 - 15);
            
            if(cost < smallest) {
                
                smallest = cost;
            }
        }
        
        if(test6 != 15) {
            
            int cost = Math.Abs(test6 - 15);
            
            if(cost < smallest) {
                
                smallest = cost;
            }
        }
        
        if(test7 != 15) {
            
            int cost = Math.Abs(test7 - 15);
            
            if(cost < smallest) {
                
                smallest = cost;
            }
        }
        
        if(test8 != 15) {
            
            int cost = Math.Abs(test8 - 15);
            
            if(cost < smallest) {
                
                smallest = cost;
            }
        }
        
        Console.WriteLine(smallest);
        
    }
}