#include <bits/stdc++.h>
#define PI 3.14159265359
#define NIL -1
using namespace std;
const int64_t MOD = 1e9 + 7;

int main() {
	int N;
	cin >> N;

	vector<int> v(N);
	for (int i = 0; i < v.size(); i++) {
		cin >> v.at(i);
	}
	sort(v.begin(), v.end());

	int cnt = 0;
	for (int i = 0; i < v.size(); i++) {
		int n = v.at(i);
		int m = i + 1;

		if (n != m) {
			cnt += abs(n - m);
		}
	}

	cout << cnt << endl;
}