import java.util.Random;
import java.util.Scanner;


public class Solution 
{	
	public static void main(String[]args)
	{
		int matrix1[][] = {{4, 9, 2}, {3, 5, 7}, {8, 1, 6}};
		int matrix2[][] = {{2, 7, 6}, {9, 5, 1}, {4, 3, 8}};
		int matrix3[][] = {{6, 1, 8}, {7, 5, 3}, {2, 9, 4}};
		int matrix4[][] = {{8, 3, 4}, {1, 5, 9}, {6, 7, 2}};
		
		int matrix5[][] = {{2, 9, 4}, {7, 5, 3}, {6, 1, 8}};
		int matrix6[][] = {{6, 7, 2}, {1, 5, 9}, {8, 3, 4}};
		int matrix7[][] = {{8, 1, 6}, {3, 5, 7}, {4, 9, 2}};
		int matrix8[][] = {{4, 3, 8}, {9, 5, 1}, {2, 7, 6}};
		
		int input[][] = new int[3][3];
		Scanner sc = new Scanner(System.in);
		for(int i = 0;i < 3;i++)
		{
			for(int j = 0;j < 3;j++)
			{
				input[i][j] = sc.nextInt();
			}
		}
		
		int cost = 0;
		int temp = 0;
		for(int i = 0;i < 3;i++)
		{
			for(int j = 0;j < 3;j++)
			{
				cost = cost + Math.abs(matrix1[i][j] - input[i][j]);
			}
		}
		temp = cost;
		cost = 0;
		for(int i = 0;i < 3;i++)
		{
			for(int j = 0;j < 3;j++)
			{
				cost = cost + Math.abs(matrix2[i][j] - input[i][j]);
			}
		}
		if(cost < temp)
			temp = cost;
		cost = 0;
		for(int i = 0;i < 3;i++)
		{
			for(int j = 0;j < 3;j++)
			{
				cost = cost + Math.abs(matrix3[i][j] - input[i][j]);
			}
		}
		if(cost < temp)
			temp = cost;
		cost = 0;
		for(int i = 0;i < 3;i++)
		{
			for(int j = 0;j < 3;j++)
			{
				cost = cost + Math.abs(matrix4[i][j] - input[i][j]);
			}
		}
		if(cost < temp)
			temp = cost;
		cost = 0;
		for(int i = 0;i < 3;i++)
		{
			for(int j = 0;j < 3;j++)
			{
				cost = cost + Math.abs(matrix5[i][j] - input[i][j]);
			}
		}
		if(cost < temp)
			temp = cost;
		cost = 0;
		for(int i = 0;i < 3;i++)
		{
			for(int j = 0;j < 3;j++)
			{
				cost = cost + Math.abs(matrix6[i][j] - input[i][j]);
			}
		}
		if(cost < temp)
			temp = cost;
		cost = 0;
		for(int i = 0;i < 3;i++)
		{
			for(int j = 0;j < 3;j++)
			{
				cost = cost + Math.abs(matrix7[i][j] - input[i][j]);
			}
		}
		if(cost < temp)
			temp = cost;
		cost = 0;
		for(int i = 0;i < 3;i++)
		{
			for(int j = 0;j < 3;j++)
			{
				cost = cost + Math.abs(matrix8[i][j] - input[i][j]);
			}
		}
		if(cost < temp)
			temp = cost;
		cost = 0;
		System.out.print(temp);
	}
}