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


int main() {
    int matrix[3][3];
    for (int i = 0; i<3; i++)
        {for (int j = 0; j<3; j++)
            {cin >> matrix[i][j];
            }
        }
    int sum[8] = {0,0,0,0,0,0,0,0};
    int m1[3][3] ={{4,9,2}
                   ,{3,5,7}
                   ,{8,1,6}};
    for (int i = 0; i<3; i++)
        {for (int j = 0; j<3; j++)
            {if (matrix[i][j] != m1[i][j]){sum[0] = sum[0] +abs((matrix[i][j]-m1[i][j]));}
            }
        }
    
    int m2[3][3] = {{8,1,6}
                    ,{3,5,7}
                    ,{4,9,2}};
    for (int i = 0; i<3; i++)
        {for (int j = 0; j<3; j++)
            {if (matrix[i][j] != m2[i][j]){sum[1] = sum[1] +abs((matrix[i][j]-m2[i][j]));}
            }
        }
    
    int m3[3][3] ={{2,9,4}
                   ,{7,5,3}
                   ,{6,1,8}};
    for (int i = 0; i<3; i++)
        {for (int j = 0; j<3; j++)
            {if (matrix[i][j] != m3[i][j]){sum[2] = sum[2] +abs((matrix[i][j]-m3[i][j]));}
            }
        }
    
    int m4[3][3] ={{2,7,6}
                   ,{9,5,1}
                   ,{4,3,8}};
    for (int i = 0; i<3; i++)
        {for (int j = 0; j<3; j++)
            {if (matrix[i][j] != m4[i][j]){sum[3] = sum[3] +abs((matrix[i][j]-m4[i][j]));}
            }
        }
    
    int m5[3][3] ={{6,7,2}
                   ,{1,5,9}
                   ,{8,3,4}};
    for (int i = 0; i<3; i++)
        {for (int j = 0; j<3; j++)
            {if (matrix[i][j] != m5[i][j]){sum[4] = sum[4] +abs((matrix[i][j]-m5[i][j]));}
            }
        }
    
    int m6[3][3] ={{4,3,8}
                   ,{9,5,1}
                   ,{2,7,6}};
    for (int i = 0; i<3; i++)
        {for (int j = 0; j<3; j++)
            {if (matrix[i][j] != m6[i][j]){sum[5] = sum[5] +abs((matrix[i][j]-m6[i][j]));}
            }
        }
    
     int m7[3][3] ={{8,3,4}
                   ,{1,5,9}
                   ,{6,7,2}};
    for (int i = 0; i<3; i++)
        {for (int j = 0; j<3; j++)
            {if (matrix[i][j] != m7[i][j]){sum[6] = sum[6] +abs((matrix[i][j]-m7[i][j]));}
            }
        }
    
    int m8[3][3] ={{6,1,8}
                   ,{7,5,3}
                   ,{2,9,4}};

    for (int i = 0; i<3; i++)
        {for (int j = 0; j<3; j++)
            {if (matrix[i][j] != m8[i][j]){sum[7] = sum[7] +abs((matrix[i][j]-m8[i][j]));}
            }
        }
     int l = sizeof(sum)/sizeof(sum[0]);
    int min = sum[0];
    for (int i=1; i<l ; i++)
        {if (sum[i] < min){min = sum[i];}}
    cout << min;
         
            
            
    
    
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}