#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
int main() {
   int size = 3;
   int matrix[3][3]; // = {{4,9,2},{3,5,7},{8,1,6}};
   int row, column = 0;
   int sum, sum1, sum2;
   int flag = 0;
    int diff=0;
 
   
   for (row = 0; row < size; row++) {
      for (column = 0; column < size; column++)
         scanf("%d", &matrix[row][column]);
   }
 
  
 
   //For diagonal elements
   sum = 0;
   for (row = 0; row < size; row++) {
      for (column = 0; column < size; column++) {
         if (row == column)
            sum = sum + matrix[row][column];
      }
   }
 
   //For Rows
   for (row = 0; row < size; row++) {
      sum1 = 0;
      for (column = 0; column < size; column++) {
         sum1 = sum1 + matrix[row][column];
      }
   }
    
   //For Columns
   for (row = 0; row < size; row++) {
      sum2 = 0;
      for (column = 0; column < size; column++) {
         sum2 = sum2 + matrix[column][row];
      }
   }
     
  if(sum>sum1){
      diff=sum-sum1;
  }
       else if(sum1>sum) {
           diff=sum1-sum;
       }
       else if(sum>sum2){
           diff=sum-sum2;
           
       }
       else if(sum2>sum){
           diff=sum2-sum;
           
       }
       else if(sum1>sum2){
           diff=sum1-sum2;
           
       }
       else if(sum2>sum1){
           diff=sum2-sum1;
       }
       else {
           diff=1;
       }
 printf("%d",diff);
   return 0;
}