#include <bits/stdc++.h>
using namespace std;
void solve() {
  long long n;
  cin >> n;
  long long ar[n];
  for (long long i = 0; i < n; i++) cin >> ar[i];
  sort(ar, ar + n);
  long long dist = 0;
  for (long long i = 0; i < n; i++) dist += (long long)abs(ar[i] - (i + 1));
  cout << dist << "\n";
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  long long T = 1;
  while (T--) solve();
  return 0;
}
