import java.util.Scanner;


public class MagicSquares {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int arr[][] = new int[3][3];
		int count[] = new int[8];
		int m1[][] = {{8,1,6},{3,5,7},{4,9,2}};
		int m2[][] = {{6,1,8},{7,5,3},{2,9,4}};
		int m3[][] = {{4,9,2},{3,5,7},{8,1,6}};
		int m4[][] = {{2,9,4},{7,5,3},{6,1,8}};
		int m5[][] = {{8,3,4},{1,5,9},{6,7,2}};
		int m6[][] = {{4,3,8},{9,5,1},{2,7,6}};
		int m7[][] = {{6,7,2},{1,5,9},{8,3,4}};
		int m8[][] = {{2,7,6},{9,5,1},{4,3,8}};
		int smallest;
		/*for(int i = 0;i<8;i++){
			System.out.println(count[i]);
		}*/
		Scanner sc = new Scanner(System.in);
		for(int i = 0;i<3;i++){
			for(int j = 0;j<3;j++){
				arr[i][j] = sc.nextInt();
				count[0] += Math.abs(arr[i][j]-m1[i][j]);
				count[2] += Math.abs(arr[i][j]-m3[i][j]);
				count[3] += Math.abs(arr[i][j]-m4[i][j]);
				count[4] += Math.abs(arr[i][j]-m5[i][j]);
				count[5] += Math.abs(arr[i][j]-m6[i][j]);
				count[6] += Math.abs(arr[i][j]-m7[i][j]);
				count[7] += Math.abs(arr[i][j]-m8[i][j]);
				
				count[1] += Math.abs(arr[i][j]-m2[i][j]);
			}
			/*for(int k= 0;k<8;k++){
				System.out.println(count[k]);
			}*/
		}
		
		smallest = count[0];
		for(int i = 1;i<8;i++){
			if(count[i]<smallest)
				smallest = count[i];
		}
		System.out.println(smallest);
		
	}

}