#include <iostream>
#include<cstdlib>
using namespace std;

int count;

void check(int A[][3], int X[][3])
{
	int c=0;
	for(int i=0; i<3; ++i)
		for(int j=0; j<3; ++j)
		{
			c+=abs(A[i][j]-X[i][j]);
		}
	if(c < count)
		count = c;
}

int main()
{
	int A1[3][3] = {{8,1,6},{3,5,7},{4,9,2}};
	int A2[3][3] = {{6,1,8},{7,5,3},{2,9,4}};
	int A3[3][3] = {{4,9,2},{3,5,7},{8,1,6}};
	int A4[3][3] = {{2,9,4},{7,5,3},{6,1,8}};
	int A5[3][3] = {{8,3,4},{1,5,9},{6,7,2}};
	int A6[3][3] = {{4,3,8},{9,5,1},{2,7,6}};
	int A7[3][3] = {{6,7,2},{1,5,9},{8,3,4}};
	int A8[3][3] = {{2,7,6},{9,5,1},{4,3,8}};
	
	int A[3][3];
	for(int i=0; i<3; ++i)
		for(int j=0; j<3; ++j)
			cin >> A[i][j];
	count = 1000;
	
	check(A, A1);check(A, A2);check(A, A3);check(A, A4);
	check(A, A5);check(A, A6);check(A, A7);check(A, A8);
	cout << count;
	return 0;
}