import java.util.Scanner;
public class sum {
public static int arraysum(int
[][]arr,int n)
{
int left =0;
int right =0;
int abs=0;
for(int I=0;I<arr.length;I++)
{
for(int J=0;J<arr.length;J++)
{
if (I==J)
left+=arr[I][J];
if (I+J==n-1)
right+=arr[I][J];
}
}
abs=left-right;
return abs;
}
public static void main(String
[]args)
{
Scanner input =new Scanner
(System.in);
int n;
n=input.nextInt();
int[][]ARR=new int[n][n]
;
for (int i=0;i<n;i++)
{
for (int j=0;j<n;j++)
{
ARR[i][j]=input.nextInt();
}
} System.out.print(Math.abs(arraysum(ARR,n))); }
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