import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
public class Main2012 {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int N = Integer.parseInt(br.readLine());
int[] arr = new int[N];
for(int i=0; i<N; i++) {
arr[i] = Integer.parseInt(br.readLine());
}
Arrays.sort(arr);
long ans = 0;
for(int i=1; i<=N; i++) {
ans += Math.abs(arr[i-1] - i);
}
System.out.println(ans);
}
}
// 1 1 2 3 5
// 1 2 3 4 5
정렬하는것이 최적의 합