#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],i,j;
    int square1[3][3]={{8,1,6},{3,5,7},{4,9,2}};
    int square2[3][3]={{6,1,8},{7,5,3},{2,9,4}};
    int square3[3][3]={{4,9,2},{3,5,7},{8,1,6}};
    int square4[3][3]={{2,9,4},{7,5,3},{6,1,8}};
    int square5[3][3]={{8,3,4},{1,5,9},{6,7,2}};
    int square6[3][3]={{4,3,8},{9,5,1},{2,7,6}};
    int square7[3][3]={{6,7,2},{1,5,9},{8,3,4}};
    int square8[3][3]={{2,7,6},{9,5,1},{4,3,8}};
    for(i=0;i<3;i++)
        {
        for(j=0;j<3;j++)
            {
            scanf("%d",&a[i][j]);
            
        }
    }
   int sum[8]={0};
    for(i=0;i<3;i++)
        {
        for(j=0;j<3;j++)
            {
            sum[0]+=abs(a[i][j]-square1[i][j]);
            sum[1]+=abs(a[i][j]-square2[i][j]);
            sum[2]+=abs(a[i][j]-square3[i][j]);
            sum[3]+=abs(a[i][j]-square4[i][j]);
            sum[4]+=abs(a[i][j]-square5[i][j]);
            sum[5]+=abs(a[i][j]-square6[i][j]);
            sum[6]+=abs(a[i][j]-square7[i][j]);
            sum[7]+=abs(a[i][j]-square8[i][j]);
        }
    }
    int largest=abs(sum[0]);
    for(i=1;i<8;i++)
        {
        sum[i]=abs(sum[i]);
        if(largest>sum[i])
        largest=sum[i];
       
    }
        printf("%d",abs(largest));
    return 0;
}