[백준] 2012번 등수 매기기

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

public class Main {
	

	public static void main(String[] args) {
		
		Scanner kb = new Scanner(System.in);
		
		int n = kb.nextInt();
		int[] arr = new int[n+1];
		
		for(int i=1; i<n+1; i++) {
			arr[i] = kb.nextInt();
		}
		
		Arrays.sort(arr);
		
		long answer = 0;
		
		for(int i=1; i<n+1; i++) {
			answer += Math.abs(arr[i]- i);
		}
		
		System.out.println(answer);

	}

}