using System;
using System.Collections.Generic;
class Program
{
	static void Main(string[] args)
	{
		string str = Console.ReadLine();
		int N = int.Parse(str);
		int[] A = new int[N];
		string[] str2 = Console.ReadLine().Split();
		for(var i=0;i<N;i++){
			A[i] = int.Parse(str2[i]);
		}
		Array.Sort(A);
		int sum = 0;
		for(var i=0;i<N;i++){
			sum += Math.Abs(A[i]-(i+1));
		}
		Console.WriteLine(sum);
	}
}