#include <cmath>
#include <iostream>
#include <algorithm>
using namespace std;
int n, a[55];
int main() {
	cin >> n;
	for (int i = 0; i < n; i++) cin >> a[i];
	sort(a, a + n);
	int sum = 0;
	for (int i = 0; i < n; i++) sum += abs(a[i] - (i + 1));
	cout << sum << '\n';
	return 0;
}