// I can do all things through Christ who strengthens me
// Philippians 4:13
#include "tickets.h"
#include <bits/stdc++.h>
using namespace std;
#define REP(i, j, k) for (int i = j; i < (k); i++)
#define RREP(i, j, k) for (int i = j; i >= (k); i--)
template <class T>
inline bool mnto(T &a, const T b) {return a > b ? a = b, 1 : 0;}
template <class T>
inline bool mxto(T &a, const T b) {return a < b ? a = b, 1 : 0;}
typedef long long ll;
typedef long double ld;
#define FI first
#define SE second
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
#define ALL(x) x.begin(), x.end()
#define SZ(x) (int) x.size()
#define pb push_back
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;
typedef tuple<int, int, int> iii;
#ifndef DEBUG
#define cerr if (0) cerr
#endif
const int INF = 1000000005;
const ll LINF = 1000000000000000005;
const int MAXN = 1505;
int n, m, k;
vector<vi> x, s;
ii diff[MAXN];
ll ans;
ll find_maximum(int _k, vector<vi> _x) {
k = _k; x = _x;
n = SZ(x); m = SZ(x[0]);
s = vector<vi>(n, vi(m, -1));
REP (i, 0, n) {
ans += x[i][m - 1];
diff[i] = {x[i][m - 1] + x[i][0], i};
s[i][m - 1] = 0;
}
sort(diff, diff + n);
REP (i, 0, n / 2) {
ans -= diff[i].FI;
s[diff[i].SE][m - 1] = -1;
s[diff[i].SE][0] = 0;
}
allocate_tickets(s);
return ans;
}
