#include <iostream>
#include <vector>

using namespace std;

int main() {
    int n; cin >> n;
    auto grid = vector<vector<int>>(n, vector<int>(n, 0));
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < n; j++) {
            cin >> grid[i][j];
        }
    }
    auto my_team = vector<bool>(n, false);
    for(int i = 0; i < n/2; i++) {
        long long best_score = -10000000000LL;
        int best_member = -1;
        for(int j = 0; j < n; j++) {
            if(my_team[j]) continue;
            long long this_score = 0;
            for(int k = 0; k < n; k++) {
                this_score += grid[j][k];
            }
            if(this_score > best_score) {
                best_score = this_score;
                best_member = j;
            }
        }
        my_team[best_member] = true;
    }

    long long result = 0;
    for(int i = 0; i < n; i++) {
        for(int j = i + 1; j < n; j++) {
            if(my_team[i] && my_team[j])
                result += grid[i][j];
            else if(!my_team[i] && !my_team[j]) {
                result -= grid[i][j];
            }
        }
    }
    cout << result << endl;
}