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


int main() {
    vector<int> a(9);
    int arr[8][9] = {{8,1,6,3,5,7,4,9,2},{4,3,8,9,5,1,2,7,6},{2,9,4,7,5,3,6,1,8},{6,7,2,1,5,9,8,3,4},{6,1,8,7,5,3,2,9,4,},{8,3,4,1,5,9,6,7,2},{4,9,2,3,5,7,8,1,6},{2,7,6,9,5,1,4,3,8}};
    int t;
    for(int i=0; i<9; i++){
        cin>>t;
        a[i] = t;
    }
    int min = 99999;
    int temp = 0;
    for(int i=0; i<8; i++){
        temp = 0;
        for(int j=0; j<9; j++){
            temp += abs(a[j]-arr[i][j]);
        }
        if(temp<min)min = temp;
    }
    cout<<min;
    return 0;
}