#include <iostream>
using namespace std;

int distance(int A[3][3], int B[3][3]) {
	int ans = 0;
	for (int k = 0; k < 3; k++)
		for (int j = 0; j < 3; j++)
			ans += abs(A[k][j] - B[k][j]);
	return ans;
}

int main() {
	int M1[3][3] = {{2, 7, 6}, {9, 5, 1}, {4, 3, 8}};
	int M2[3][3] = {{2, 9, 4}, {7, 5, 3}, {6, 1, 8}};
	int M3[3][3] = {{4, 3, 8}, {9, 5, 1}, {2, 7, 6}};
	int M4[3][3] = {{4, 9, 2}, {3, 5, 7}, {8, 1, 6}};
	int M5[3][3] = {{6, 1, 8}, {7, 5, 3}, {2, 9, 4}};
	int M6[3][3] = {{6, 7, 2}, {1, 5, 9}, {8, 3, 4}};
	int M7[3][3] = {{8, 1, 6}, {3, 5, 7}, {4, 9, 2}};
	int M8[3][3] = {{8, 3, 4}, {1, 5, 9}, {6, 7, 2}};
	
	int A[3][3];
	for (int k = 0; k < 3; k++)
		for (int j = 0; j < 3; j++)
			cin >> A[k][j];
	int Min = 1e9;
	Min = min(Min, distance(A, M1));
	Min = min(Min, distance(A, M2));
	Min = min(Min, distance(A, M3));
	Min = min(Min, distance(A, M4));
	Min = min(Min, distance(A, M5));
	Min = min(Min, distance(A, M6));
	Min = min(Min, distance(A, M7));
	Min = min(Min, distance(A, M8));
	cout << Min << endl;
	return 0;
}