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

public class Program
{

    public void Proc()
    {
        int inputCount = int.Parse(Reader.ReadLine());
        int[] items = Reader.ReadLine().Split(' ').Select(a => int.Parse(a)).OrderBy(a => a).ToArray();
        int ans = 0;
        for (int i = 0; i < items.Length; i++) {
            ans += Math.Abs((i + 1) - items[i]);
        }
        Console.WriteLine(ans);
    }


	public class Reader
    {
        static StringReader sr;
        public static bool IsDebug = false;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (sr == null)
                {
                    sr = new StringReader(InputText.Trim());
                }
                return sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
        private static string InputText = @"



9
1 4 1 4 2 1 3 5 6



";
    }

    public static void Main(string[] args)
    {
#if DEBUG
        Reader.IsDebug = true;
#endif
        Program prg = new Program();
        prg.Proc();
    }
}