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

int ms[8][9] = { {8, 1, 6, 3, 5, 7, 4, 9, 2},
                {6, 1, 8, 7, 5, 3, 2, 9, 4},
                {8, 3, 4, 1, 5, 9, 6, 7, 2},
                {4, 3, 8, 9, 5, 1, 2, 7, 6},
                {6, 7, 2, 1, 5, 9, 8, 3, 4},
                {2, 7, 6, 9, 5, 1, 4, 3, 8},
                {4, 9, 2, 3, 5, 7, 8, 1, 6},
                {2, 9, 4, 7, 5, 3, 6, 1, 8} };

int main() {
    vector<int> s(9, 0);
    for(int i=0;i<9;i++) cin >> s[i];
    auto min_diff = 999999;
    for(int i=0;i<8;i++){
        auto diff=0;
        for(int j=0;j<9;j++){
            diff += abs(s[j]-ms[i][j]);
        }
        min_diff=min(min_diff, diff);
    }
    cout << min_diff << endl ;
    return 0;
}