#ifdef _MSC_VER
#  define _CRT_SECURE_NO_WARNINGS
#  define _USE_MATH_DEFINES
#  include <intrin.h>
#  define __builtin_popcount __popcnt
#endif

#include <bits/stdc++.h>
using namespace std;
using i32 = int; using i64 = long long int; using f64 = double; using str = string;
using u32 = unsigned int; using u64 = unsigned long long int;
template <typename T> using vec = vector<T>;
void in() {}; template <typename T, typename...TS> void in(T &&x, TS &&...xs) { cin >> x; in(move(xs)...); };
template <typename T> void out(T &&x) { cout << x << "\n"; }; template <typename T, typename...TS> void out(T &&x, TS &&...xs) { cout << x << " "; out(move(xs)...); }
#define indef(t, ...) t __VA_ARGS__; in(__VA_ARGS__)
#define get(t) []{ t _; cin >> _; return _; }()
#define times(n, i) for (i32 i =  0 ; i < (n); ++i)
#define range(a, b, i) for (i32 i = (a); i < (b); ++i)
#define upto(a, b, i) for (i32 i = (a); i <= (b); ++i)
#define downto(a, b, i) for (i32 i = (a); i >= (b); --i)
#define all(xs) (xs).begin(), (xs).end()
#define sortall(xs) sort(all(xs))
#define reverseall(xs) reverse(all(xs))
#define even(x) ((abs(x) & 1) == 0)
#define odd(x) ((abs(x) & 1) == 1)
#define bit(x, i) (((x) >> i) & 1)
#define append emplace_back
#define findge lower_bound
#define findgt upper_bound
const i64 MOD = 1000000007ll;
const f64 EPS = 1e-10;

i32 n;
i32 f[24][24];
i32 dp[1<<24];

i32 solve() {
    in(n);
    times(n, ni) {
        times(n, nj) {
            in(f[ni][nj]);
        }
    }
    times(1<<n, bi) {
        if (!even(static_cast<i32>(__builtin_popcount(bi)))) continue;
        times(n-1, ni) {
            if (bit(bi, ni) > 0) continue;
            range(ni+1, n, nj) {
                if (bit(bi, nj) > 0) continue;
                i32 bj = bi | ((1<<ni) | (1<<nj));
                dp[bj] = max(dp[bj], dp[bi] + f[ni][nj]);
            }
            break;
        }
    }
    return dp[(1<<n)-1];
}

i32 main()
{
    ios::sync_with_stdio(false);

#ifdef _MSC_VER
    /**
    ifstream fin("input.txt"); cin.rdbuf(fin.rdbuf()); assert(fin);
    ofstream fout("output.txt"); cout.rdbuf(fout.rdbuf()); assert(fout);
    /**/
#endif

    out(solve());

    return 0;
}