using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace Contest
{
    struct R
    {
        public string S;
        public int P;
        public int Index;
        public R(string s, int p, int i)
        {
            S = s;
            P = p;
            Index = i;
        }
    }
    class Program
    {
        public void Solve()
        {
            var sc = new Scanner();
            int N = sc.NextInt();
            int K = sc.NextInt();
            int[] V = sc.IntArray();
            long ans = 0;
            for (int migi = 0; migi <= K; migi++)
            {
                for (int hidari = 0; migi + hidari <= Math.Min(N, K); hidari++)
                {
                    for (int tsume = 0; migi + hidari + tsume <= K && migi + hidari >= tsume; tsume++)
                    {
                        long v = 0;
                        List<int> l = new List<int>();
                        for (int i = 0; i < migi; i++)
                        {
                            v += V[i];
                            l.Add(V[i]);
                        }

                        for (int i = 0; i < hidari; i++)
                        {
                            v += V[N + ~i];
                            l.Add(V[N + ~i]);
                        }
                        l.Sort();
                        for (int i = 0; i < tsume; i++)
                        {
                            v -= l[i];
                        }

                        ans = Math.Max(ans, v);
                    }
                }
            }
            Console.WriteLine(ans);
        }
        static void Main() => new Program().Solve();
    }
}

class Scanner
{
    public Scanner()
    {
        _stream = new StreamReader(Console.OpenStandardInput());
        _pos = 0;
        _line = new string[0];
        _separator = ' ';
    }
    private char _separator;
    private StreamReader _stream;
    private int _pos;
    private string[] _line;
    #region get a element
    public string Next()
    {
        if (_pos >= _line.Length)
        {
            _line = _stream.ReadLine().Split(_separator);
            _pos = 0;
        }
        return _line[_pos++];
    }
    public int NextInt()
    {
        return int.Parse(Next());
    }
    public long NextLong()
    {
        return long.Parse(Next());
    }
    public double NextDouble()
    {
        return double.Parse(Next());
    }
    #endregion
    #region convert array
    private int[] ToIntArray(string[] array)
    {
        var result = new int[array.Length];
        for (int i = 0; i < array.Length; i++)
        {
            result[i] = int.Parse(array[i]);
        }

        return result;
    }
    private long[] ToLongArray(string[] array)
    {
        var result = new long[array.Length];
        for (int i = 0; i < array.Length; i++)
        {
            result[i] = long.Parse(array[i]);
        }

        return result;
    }
    private double[] ToDoubleArray(string[] array)
    {
        var result = new double[array.Length];
        for (int i = 0; i < array.Length; i++)
        {
            result[i] = double.Parse(array[i]);
        }

        return result;
    }
    #endregion
    #region get array
    public string[] Array()
    {
        if (_pos >= _line.Length)
            _line = _stream.ReadLine().Split(_separator);
        _pos = _line.Length;
        return _line;
    }
    public int[] IntArray()
    {
        return ToIntArray(Array());
    }
    public long[] LongArray()
    {
        return ToLongArray(Array());
    }
    public double[] DoubleArray()
    {
        return ToDoubleArray(Array());
    }
    #endregion
}

Measured memory_bytes: 15312