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

int diff(int s[][3],int m[][3])
{
  int ans=0,i,j;
  for(i=0;i<3;i++)
  {
    for(j=0;j<3;j++)
     {
        ans+=abs(s[i][j]-m[i][j]);
      
    }
  }
  return ans;
}


int main() {
  int i,j,k,max=100,di;
  
  int s[3][3],a[3][3]={{2,7,6},{9,5,1},{4,3,8}},b[3][3]={{2,9,4},{7,5,3},{6,1,8}},c[3][3]={{6,1,8},{7,5,3},{2,9,4}},
    d[3][3]={{6,7,2},{1,5,9},{8,3,4}},e[3][3]={{8,3,4},{1,5,9},{6,7,2}},f[3][3]={{8,1,6},{3,5,7},{4,9,2}},
    g[3][3]={{4,9,2},{3,5,7},{8,1,6}},h[3][3]={{4,3,8},{9,5,1},{2,7,6}};
  for(i=0;i<3;i++)
  {
    for(j=0;j<3;j++)
    {
      scanf("%d",&s[i][j]);
    }
  }
di=diff(s,a);
  max=max<di?max:di;
 di=diff(s,b);
  max=max<di?max:di;
  di=diff(s,c);
  max=max<di?max:di;
  di=diff(s,d);
  max=max<di?max:di;
   di=diff(s,e);
  max=max<di?max:di;
    di=diff(s,f);
  max=max<di?max:di;
  di=diff(s,g);
  max=max<di?max:di;
  di=diff(s,h);
  max=max<di?max:di;
  printf("%d",max);
  
  
  /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    return 0;
}