#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

int main() {

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    int a[3][3];
    int cost[9]={0,0,0,0,0,0,0,0,0};
    int sq1[3][3]={{8,1,6},{3,5,7},{4,9,2}};
    int sq2[3][3]={{6,1,8},{7,5,3},{2,9,4}};
    int sq3[3][3]={{4,9,2},{3,5,7},{8,1,6}};
    int sq4[3][3]={{2,9,4},{7,5,3},{6,1,8}};
    int sq5[3][3]={{8,3,4},{1,5,9},{6,7,2}};
    int sq6[3][3]={{4,3,8},{9,5,1},{2,7,6}};
    int sq7[3][3]={{6,7,2},{1,5,9},{8,3,4}};
    int sq8[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++){
            scanf("%d",&a[i][j]);
            cost[1]+=abs(a[i][j] - sq1[i][j]);
            cost[2]+=abs(a[i][j] - sq2[i][j]);
            cost[3]+=abs(a[i][j] - sq3[i][j]);
            cost[4]+=abs(a[i][j] - sq4[i][j]);
            cost[5]+=abs(a[i][j] - sq5[i][j]);
            cost[6]+=abs(a[i][j] - sq6[i][j]);
            cost[7]+=abs(a[i][j] - sq7[i][j]);
            cost[8]+=abs(a[i][j] - sq8[i][j]);
        }
    }
    int min = cost[1];
    for(int i=2;i<=8;i++)
        if(cost[i]<min)
            min=cost[i];
    printf("%d",min);
    return 0;
}