import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws FileNotFoundException {
		new Main().run();
	}

	void run() throws FileNotFoundException {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[] A = new int[N];
		if (!(1 <= N && N <= 50))
			throw new AssertionError();
		for (int i = 0; i < N; ++i) {
			A[i] = sc.nextInt();
			if (!(1 <= A[i] && A[i] <= N))
				throw new AssertionError();
		}
		Arrays.sort(A);
		int ans = 0;
		for (int i = 0; i < N; ++i) {
			ans += Math.abs(A[i] - (i + 1));
		}
		System.out.println(ans);
	}

	void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}
}