import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		int []A = new int[N];
		for(int i = 0; i < N; i++) {
			A[i] = scan.nextInt();
		}
		scan.close();
		Arrays.sort(A);
		int sum = 0;
		for(int i = N - 1; i >= 0; i--) {
			sum += Math.abs(i + 1 - A[i]);
		}
		System.out.println(sum);
	}
}