import java.util.*;

public class Solution {
	
	private static int[][] getMagicSquare(int i) {
		switch(i) {
		case 1:
			return new int[][]{
				{8, 1, 6},
				{3, 5, 7},
				{4, 9, 2}
			};
		case 2:
			return new int[][]{
				{4, 3, 8},
				{9, 5, 1},
				{2, 7, 6}
			};
		case 3:
			return new int[][]{
				{2, 9, 4},
				{7, 5, 3},
				{6, 1, 8}
			};
		case 4:
			return new int[][]{
				{6, 7, 2},
				{1, 5, 9},
				{8, 3, 4}
			};
		case 5:
			return new int[][]{
				{6, 1, 8},
				{7, 5, 3},
				{2, 9, 4}
			};
		case 6:
			return new int[][]{
				{8, 3, 4},
				{1, 5, 9},
				{6, 7, 2}
			};
		case 7:
			return new int[][]{
				{4, 9, 2},
				{3, 5, 7},
				{8, 1, 6}
			};
		case 8:
			return new int[][]{
				{2, 7, 6},
				{9, 5, 1},
				{4, 3, 8}
			};
		}
		
		return null;
	}
	
	private static int compare(int[][] inSquare, int k) {
		int[][] compSquare = getMagicSquare(k);
		
		int retVal = 0;
		
		for(int i=0; i<3; i++) {
        	for(int j=0; j<3; j++) {
        		retVal += Math.abs(inSquare[i][j]-compSquare[i][j]);
        	}
        }
		
		return retVal;
	}

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int[][] inSquare = new int[3][3];
        
        for(int i=0; i<3; i++) {
        	for(int j=0; j<3; j++) {
        		inSquare[i][j] = in.nextInt();
        	}
        }
        
        int minCost = Integer.MAX_VALUE;
        for(int i=1; i<=8; i++) {
        	int cost = compare(inSquare, i);
        	if (cost < minCost) minCost = cost;
        }
        
        System.out.println(minCost);
    }
}