using System;
using static System.Console;
using static System.Math;

public class Hello{
    public static void Main(){
        int kazu = int.Parse(ReadLine());
        string[] number = ReadLine().Split(' ');
        int[] num = new int[kazu];
        for(int i=0;i<kazu;i++){
            num[i] = int.Parse(number[i]);
        }
        for(int j=0;j<kazu;j++){
            for(int i=0;i<kazu-1;i++){
                if(num[i] > num[i+1]){
                    int temp = num[i];
                    num[i] = num[i+1];
                    num[i+1] = temp;
                }
            }
        }
        
        int count = 0;
        for(int i=0;i<kazu;i++){
            count += Abs((i+1)-num[i]);
        }
        WriteLine(count);
    }
}