import static java.lang.System.*;
import java.util.*;

public class Main {
	//初期フィールド・メソッド---------------------------------------------
	static Scanner sc = new Scanner(System.in);
	static int min(int... ar) {Arrays.sort(ar); return ar[0];}
	static int max(int... ar) {Arrays.sort(ar); return ar[ar.length-1];}
	//------------------------------------------------------------


	//フィールド追加場所-----------------------------------------------
	//------------------------------------------------------------


	//メソッド追加場所------------------------------------------------
	//------------------------------------------------------------


	//mainメソッド---------------------------------------------------
	public static void main(String[] args) {
		int n = sc.nextInt();
		int[] ar = new int[n];
		for (int i=0; i<n; i++) ar[i] = sc.nextInt();
		Arrays.sort(ar);
		
		int cost = 0;
		for (int i=0; i<n; i++) {
			cost += Math.abs(ar[i]-(i+1));
		}
		
		out.println(cost);
	}
	//------------------------------------------------------------
}