import java.util.*;
public class main {
	public static void main(String args[]){
		Scanner data = new Scanner(System.in);
		int arr[][] = new int[3][3];
		for(int i=0;i<3;i++){
			for(int j=0;j<3;j++){
				arr[i][j]=data.nextInt();
			}
			//data.nextLine();
		}
		square s = new square();
		System.out.println(s.check(arr));
	}
}
class square{
	int check(int[][] arr){
		int count,min=1000;
		int cnt[] =new int[8];
		int a1[][][] = {{{6,1,8},{7,5,3},{2,9,4}},{{8,1,6},{3,5,7},{4,9,2}},{{8,3,4},{1,5,9},{6,7,2}},{{6,7,2},{1,5,9},{8,3,4}},{{4,9,2},{3,5,7},{8,1,6}},{{2,9,4},{7,5,3},{6,1,8}},{{2,7,6},{9,5,1},{4,3,8}},{{4,3,8},{9,5,1},{2,7,6}}};
		for(int i=0;i<8;i++){
			 count = 0;
			for(int j=0;j<3;j++){
				for(int k=0;k<3;k++){
					count=count+Math.abs(arr[j][k]-a1[i][j][k]);
				}
			}
			cnt[i]=count;
		}
		for(int i=0;i<8;i++){
			if(cnt[i]<min)
				min = cnt[i];
		}
		return min;
	}
	
}