import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] a = new int[n];
        for(int i=0; i<n; i++) a[i] = in.nextInt();

        Arrays.sort(a);

        int sum = 0;
        for(int i=0; i<n; i++) {
            sum += Math.abs(a[i] - (i + 1));
        }

        System.out.println(sum);
    }
}