using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
		int[,] m_square = new int[3,3];
		string[] input0 = Console.ReadLine().Split(' ');
		string[] input1 = Console.ReadLine().Split(' ');
		string[] input2 = Console.ReadLine().Split(' ');
		
		for (int i = 0; i < 3; i++) {
			m_square[0,i] = Convert.ToInt32(input0[i]);
			m_square[1,i] = Convert.ToInt32(input1[i]);
			m_square[2,i] = Convert.ToInt32(input2[i]);
		}
		
		int[][] test = new int[8][];
		test[0] = new int[9] {8,1,6,3,5,7,4,9,2};
		test[1] = new int[9] {6,1,8,7,5,3,2,9,4};
		test[2] = new int[9] {4,3,8,9,5,1,2,7,6};
		test[3] = new int[9] {2,7,6,9,5,1,4,3,8};
		test[4] = new int[9] {2,9,4,7,5,3,6,1,8};
		test[5] = new int[9] {4,9,2,3,5,7,8,1,6};
		test[6] = new int[9] {6,7,2,1,5,9,8,3,4};
		test[7] = new int[9] {8,3,4,1,5,9,6,7,2};

		int counter = 0;
		int val = 0;
		int temp = 0;
		int minValue = 600;
		
		for (int i = 0; i < 8; i++) {
			counter = 0;
			val = 0;
			temp = 0;
			foreach (int N in m_square) {
				temp = N-test[i][counter];
				counter++;
				val = Math.Abs(temp)+val;
			}
			if (val<minValue) minValue = val;
		}
		
		Console.WriteLine(Math.Abs(minValue));
    }
}