import std.stdio;
import std.math;

void main() {
        int N;
        readf(" %d",&N);
        int [][] arr = new int[][N];
        foreach(ref v;arr) {
                v = new int[N];
        }
        for(int i=0;i<N;++i) {
                foreach(ref v;arr[i]) {
                        readf(" %d",&v);
                }
        }
        writeln(arr);
        int sum1,sum2;
        for(int i=0;i<N;++i) {
                sum1 += abs(arr[i][i]);
                sum2 += abs(arr[i][N-i-1]);
        }
        writeln(abs(sum1-sum2));
}