using System;
using System.Collections.Generic;
using System.Linq;
using Debug = System.Diagnostics.Debug;
//using System.Numerics;
//using static System.Math;
using Number = System.Int64;

namespace Program {
    public class Solver {
        //const long MOD = (long)1e9 + 7;
        public void Solve() {
            var n = ri; var T = ri;
            var a = Enumerate(n, x => ri);
            Array.Sort(a);

            var dp = Enumerate(T + 1, x => Enumerate(n, y => new int[n]));
            var arg = Enumerate(T + 1, x => Enumerate(n, y => new int[n]));
            for (int k = 0; k <= T; k++)
                for (int i = 0; i < n; i++)
                    for (int j = 0; j < n; j++) {
                        dp[k][i][j] = 1000000000;
                        arg[k][i][j] = -1;
                    }
            for (int i = 0; i < n; i++)
                for (int k = 0; k <= T; k++) {
                    dp[k][i][i] = 0;
                    arg[k][i][i] = i;
                }
            for (int d = 1; d < n; d++)
                for (int i = 0; i < n; i++) {
                    var j = i + d;
                    if (j >= n) break;
                    //Debug.WriteLine($"{i} {j}");
                    for (int k = 1; k <= T; k++) {
                        var l = Math.Max(i, arg[k][i][j - 1] - 1);
                        var r = Math.Min(j, arg[k][i + 1][j] + 1);
                        for (int p = l + 1; p <= r; p++) {
                            var v = dp[k - 1][i][p - 1] + dp[k - 1][p][j] + a[j] - a[p - 1];
                            if (dp[k][i][j] > v) {
                                dp[k][i][j] = v;
                                arg[k][i][j] = p - 1;
                            }
                        }
                    }
                }
            Console.WriteLine(dp[T][0][n - 1]);
        }
        const long INF = 1L << 60;
        //int[] dx = { 1, 0, -1, 0 };
        //int[] dy = { 0, 1, 0, -1 };
        //*
        int ri { get { return sc.Integer(); } }
        long rl { get { return sc.Long(); } }
        double rd { get { return sc.Double(); } }
        string rs { get { return sc.Scan(); } }
        //*/

        public IO.StreamScanner sc = new IO.StreamScanner(Console.OpenStandardInput());
        static T[] Enumerate<T>(int n, Func<int, T> f) { var a = new T[n]; for (int i = 0; i < n; ++i) a[i] = f(i); return a; }
        static public void Swap<T>(ref T a, ref T b) { var tmp = a; a = b; b = tmp; }
    }
}

#region main
static class Ex {
    static public string AsString(this IEnumerable<char> ie) { return new string(ie.ToArray()); }
    static public string AsJoinedString<T>(this IEnumerable<T> ie, string st = " ") {
        return string.Join(st, ie.Select(x => x.ToString()).ToArray());
        //return string.Join(st, ie);
    }
    static public void Main() {
        Console.SetOut(new System.IO.StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });
        var solver = new Program.Solver();
        solver.Solve();
        Console.Out.Flush();
    }
}
#endregion
#region Ex
namespace Program.IO {
    using System.Globalization;
    using System.IO;
    using System.Text;
    public class Printer: StreamWriter {
        public override IFormatProvider FormatProvider { get { return CultureInfo.InvariantCulture; } }
        public Printer(Stream stream) : base(stream, new UTF8Encoding(false, true)) { }
    }
    public class StreamScanner {
        public StreamScanner(Stream stream) { str = stream; }
        public readonly Stream str;
        private readonly byte[] buf = new byte[1024];
        private int len, ptr;
        public bool isEof = false;
        public bool IsEndOfStream { get { return isEof; } }
        private byte read() {
            if (isEof) return 0;
            if (ptr >= len) { ptr = 0; if ((len = str.Read(buf, 0, 1024)) <= 0) { isEof = true; return 0; } }
            return buf[ptr++];
        }
        public char Char() { byte b = 0; do b = read(); while ((b < 33 || 126 < b) && !isEof); return (char)b; }

        public string Scan() {
            var sb = new StringBuilder();
            for (var b = Char(); b >= 33 && b <= 126; b = (char)read())
                sb.Append(b);
            return sb.ToString();
        }
        public string ScanLine() {
            var sb = new StringBuilder();
            for (var b = Char(); b != '\n' && b != 0; b = (char)read())
                if (b != '\r') sb.Append(b);
            return sb.ToString();
        }
        public long Long() { return isEof ? long.MinValue : long.Parse(Scan()); }
        public int Integer() { return isEof ? int.MinValue : int.Parse(Scan()); }
        public double Double() { return isEof ? double.NaN : double.Parse(Scan(), CultureInfo.InvariantCulture); }
    }
}
#endregion


Measured memory_bytes: 394384