using System;
using System.Linq;
using static System.Console;
class Program
{
    
    static void Main(string[] args)
    {
        var n = int.Parse(ReadLine());
        var inputArr = ReadLine().Split(' ');
        var nums = inputArr.Select(s => int.Parse(s)).ToArray();
        Array.Sort(nums);
        var cnt = 0;
        var i = 1;
        foreach(var x in nums)
        {
            if(x > i)
            {
                cnt += x - i;
            }else if(x < i)
            {
                cnt += i - x;
            }
            i++;
        }

        WriteLine(cnt);
    }
}