#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

int DiffCount( const vector<int> & mat1, const vector<int> & mat2 ){
    int cost = 0;
    
    for( int i =0; i < 9; ++i ){
        cost += abs(mat1[i]-mat2[i]);
    }
    
    return cost;
}

int main() {
    vector<vector<int>> magic = {
        { 4, 9, 2, 3, 5, 7, 8, 1, 6 }, { 8, 3, 4, 1, 5, 9, 6, 7, 2 }, 
        { 2, 7, 6, 9, 5, 1, 4, 3, 8 }, { 6, 1, 8, 7, 5, 3, 2, 9, 4 }, 
        { 2, 9, 4, 7, 5, 3, 6, 1, 8 }, { 6, 7, 2, 1, 5, 9, 8, 3, 4 }, 
        { 8, 1, 6, 3, 5, 7, 4, 9, 2 }, { 4, 3, 8, 9, 5, 1, 2, 7, 6 }
    };
    
    vector<int> matrix(9);
    for(int i = 0; i < 9; ++i){
        cin >> matrix[i];
    }
    
    int minDiff = 999;
    
    for( auto magicTable : magic ){
        minDiff = min( minDiff, DiffCount( matrix, magicTable ) );
    }
    
    cout << minDiff;
    
    return 0;
}