import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        List<Integer> list = new ArrayList<Integer>();
        for(int i = 0 ; i < n ; i++){
        	list.add(scan.nextInt());
        }
        Collections.sort(list);
        int count = 0;
        for(int i = 0 ; i < n ; i++){
        	if(list.get(i) < i+1){
        		count += (i+1) - list.get(i);
        	}else if(list.get(i) > i+1){
        		count += list.get(i) - (i+1);
        	}
        }
        System.out.println(count);
    }
}