using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Globalization;
using System.Diagnostics;
using static System.Console;
using Pair = System.Collections.Generic.KeyValuePair<int, int>;
//using System.Numerics;

class Program
{
    static void Main()
    {
        //SetOut(new StreamWriter(OpenStandardOutput()) { AutoFlush = false });
        new Program().Solve();
        Out.Flush();
    }
    Scanner cin = new Scanner();
    Random rnd = new Random();
    Stopwatch sw = new Stopwatch();
    readonly int[] dd = { 0, 1, 0, -1, 0 };
    readonly int mod = 1000000007;
    readonly string alfa = "abcdefghijklmnopqrstuvwxyz";


    void Solve()
    {
        int N = cin.Nextint;
        var F = new int[N][];
        for (int i = 0; i < N; i++)
        {
            F[i] = cin.Scanint;
        }
        var dp = Enumerable.Repeat(-1, 1 << N).ToArray();
        dp[0] = 0;
        for (int i = 0; i < 1 << N; i++)
        {
            if (dp[i] < 0) continue;
            int j = 0;
            while((i >> j & 1) == 1)
            {
                j++;
            }
            for (int r = j + 1; r < N; r++)
            {
                if ((i >> r & 1) == 1) continue;
                dp[i | 1 << j | 1 << r] = Math.Max(dp[i] + F[j][r], dp[i | 1 << j | 1 << r]);
            }
        }
        //WriteLine(string.Join(" ", dp));
        WriteLine(dp[(1 << N) - 1]);

    }

}

class Scanner
{
    string[] s; int i;
    char[] cs = new char[] { ' ' };
    public Scanner() { s = new string[0]; i = 0; }
    public string[] Scan { get { return ReadLine().Split(); } }
    public int[] Scanint { get { return Array.ConvertAll(Scan, int.Parse); } }
    public long[] Scanlong { get { return Array.ConvertAll(Scan, long.Parse); } }
    public double[] Scandouble { get { return Array.ConvertAll(Scan, double.Parse); } }
    public string Next
    {
        get
        {
            if (i < s.Length) return s[i++];
            string st = ReadLine();
            while (st == "") st = ReadLine();
            s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
            i = 0;
            return Next;
        }
    }
    public int Nextint { get { return int.Parse(Next); } }
    public long Nextlong { get { return long.Parse(Next); } }
    public double Nextdouble { get { return double.Parse(Next); } }
}