#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
	int N;
	cin >> N;
	vector<int> A(N);
	for (int i = 0; i < N; i++){
		cin >> A[i];
	}
	sort(A.begin(), A.end());
	int ans = 0;
	for (int i = 0; i < N; i++){
		ans += abs(A[i] - (i + 1));
	}
	cout << ans << endl;
}