using System;
using CompLib.Util;

public class Program
{
    private const int MaxY = 10000;

    public void Solve()
    {
        var sc = new Scanner();
        int n = sc.NextInt();
        int[] y = sc.IntArray();


        var dp = new int[(n + 1) * (MaxY + 1)];
        for (int i = 0; i <= n; i++)
        {
            for (int j = 0; j <= MaxY; j++)
            {
                dp[C(i, j)] = int.MaxValue;
            }
        }

        dp[C(0, 0)] = 0;

        for (int i = 1; i <= n; i++)
        {
            int min = int.MaxValue;
            for (int j = 0; j <= MaxY; j++)
            {
                min = Math.Min(min, dp[C(i - 1, j)]);
                dp[C(i, j)] = min + Math.Abs(y[i - 1] - j);
            }
        }

        int ans = int.MaxValue;
        for (int i = 0; i <= MaxY; i++)
        {
            ans = Math.Min(ans, dp[C(n, i)]);
        }

        Console.WriteLine(ans);
    }

    int C(int i, int j)
    {
        return i * (MaxY + 1) + j;
    }

    public static void Main(string[] args) => new Program().Solve();
}

namespace CompLib.Util
{
    using System;
    using System.Linq;

    class Scanner
    {
        private string[] _line;
        private int _index;
        private const char Separator = ' ';

        public Scanner()
        {
            _line = new string[0];
            _index = 0;
        }

        public string Next()
        {
            while (_index >= _line.Length)
            {
                _line = Console.ReadLine().Split(Separator);
                _index = 0;
            }

            return _line[_index++];
        }

        public int NextInt() => int.Parse(Next());
        public long NextLong() => long.Parse(Next());
        public double NextDouble() => double.Parse(Next());
        public decimal NextDecimal() => decimal.Parse(Next());
        public char NextChar() => Next()[0];
        public char[] NextCharArray() => Next().ToCharArray();

        public string[] Array()
        {
            _line = Console.ReadLine().Split(Separator);
            _index = _line.Length;
            return _line;
        }

        public int[] IntArray() => Array().Select(int.Parse).ToArray();
        public long[] LongArray() => Array().Select(long.Parse).ToArray();
        public double[] DoubleArray() => Array().Select(double.Parse).ToArray();
        public decimal[] DecimalArray() => Array().Select(decimal.Parse).ToArray();
    }
}