#include <iostream>
#include <algorithm>
#include <cmath>
using namespace std;

int n, a[1009];

int main() {
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
	}
	sort(a + 1, a + n + 1);
	int sum = 0;
	for (int i = 1; i <= n; i++) sum += abs(i - a[i]);
	cout << sum << endl;
	return 0;
}