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

namespace YukiCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int N = int.Parse(Console.ReadLine());
            var nSum = Console.ReadLine().Split().Select(int.Parse).OrderBy(x=>x).Select((n,i)=>n<i+1?i+1-n:n-i-1).Sum();
            Console.WriteLine(nSum);
            Console.ReadLine();
        }
    }
}