using System;
using System.Linq;
 
class Program
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        var arr = Console.ReadLine().Trim().Split(' ');
        var iter =
            from x in arr
            select int.Parse(x);
        var a = iter.ToArray();
        Array.Sort(a);
 
        var ans = 0;
        for (var i = 1; i <= n; ++i)
        {
            ans += Math.Abs(i - a[i - 1]);
        }
 
        Console.WriteLine(ans);
    }
}