using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using Enu = System.Linq.Enumerable;

class Program
{
    static readonly int INF = (int)1e9;

    public void Solve()
    {
        int N = Reader.Int(), Size = Reader.Int();
        var Val = Reader.IntArray(N);
        int ans = -INF;

        for (int useFirst = 0; useFirst < 2; useFirst++)
        {
            var dp = MakeArray3(N + 1, 2, N + 1, -INF);

            dp[1][useFirst][useFirst] = 0;
            for (int i = 1; i < N; i++)
                for (int used = 0; used < 2; used++)
                    for (int count = 0; count <= i; count++)
                        if (dp[i][used][count] > -INF)
                        {
                            CheckMax(ref dp[i + 1][0][count], dp[i][used][count]);
                            if (count < Size)
                                CheckMax(ref dp[i + 1][1][count + 1], dp[i][used][count] + Val[i - 1] * used);
                        }
            if (useFirst == 1) dp[N][1][Size] += Val[N - 1];
            CheckMax(ref ans, Math.Max(dp[N][0][Size], dp[N][1][Size]));
        }

        Console.WriteLine(ans);
    }

    void CheckMax(ref int a, int b) { if (b > a) a = b; }

    public static T[][][] MakeArray3<T>(int size1, int size2, int size3, T val)
    {
        var res = new T[size1][][];
        for (int a = 0; a < res.Length; a++)
        {
            res[a] = new T[size2][];
            for (int b = 0; b < res[a].Length; b++)
            {
                res[a][b] = new T[size3];
                for (int c = 0; c < res[a][b].Length; c++)
                    res[a][b][c] = val;
            }
        }
        return res;
    }
}


class Entry { static void Main() { new Program().Solve(); } }
class Reader
{
    private static TextReader reader = Console.In;
    private static readonly char[] separator = { ' ' };
    private static readonly StringSplitOptions op = StringSplitOptions.RemoveEmptyEntries;
    private static string[] A = new string[0];
    private static int i;
    private static void Init() { A = new string[0]; }
    public static void Set(TextReader r) { reader = r; Init(); }
    public static void Set(string file) { reader = new StreamReader(file); Init(); }
    public static bool HasNext() { return CheckNext(); }
    public static string String() { return Next(); }
    public static int Int() { return int.Parse(Next()); }
    public static long Long() { return long.Parse(Next()); }
    public static double Double() { return double.Parse(Next()); }
    public static int[] IntLine() { return Array.ConvertAll(Split(Line()), int.Parse); }
    public static int[] IntArray(int N) { return Enu.Range(0, N).Select(i => Int()).ToArray(); }
    public static int[][] IntTable(int H) { return Enu.Range(0, H).Select(i => IntLine()).ToArray(); }
    public static string[] StringArray(int N) { return Enu.Range(0, N).Select(i => Next()).ToArray(); }
    public static string Line() { return reader.ReadLine().Trim(); }
    private static string[] Split(string s) { return s.Split(separator, op); }
    private static string Next() { CheckNext(); return A[i++]; }
    private static bool CheckNext()
    {
        if (i < A.Length) return true;
        string line = reader.ReadLine();
        if (line == null) return false;
        if (line == "") return CheckNext();
        A = Split(line);
        i = 0;
        return true;
    }
}