#include<bits/stdc++.h>
using namespace std;
#define debug(x) cout<<#x<<':'<<x<<endl;
typedef long long ll;
typedef pair<ll,ll> pii;
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin >> n;
    vector<ll> a(n + 1);
    for (int i = 1; i <= n; ++i) {
        int x;
        for (int j = 1; j <= n; ++j)
            cin >> x, a[i] += x;
    } 
    sort(a.begin() + 1, a.end());
    ll sum1 = 0, sum2 = 0;
    for (int i = 1; i <= n / 2; ++i)
        sum1 += a[i];
    for (int i = 1; i <= n / 2 + 1; ++i)
        sum2 += a[i];
    cout << sum2 - sum1 << '\n';
    return 0;
}