#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios::sync_with_stdio(false);
  int n;
  cin >> n;
  vector<int> a(n);
  for (int i = 0; i < n; ++i) cin >> a[i];
  sort(a.begin(), a.end());
  int s = 0;
  for (int i = 0; i < n; ++i) s += abs(i + 1 - a[i]);
  cout << s << endl;
}