#include <bits/stdc++.h>
using namespace std;

int main(){
  int n; cin >> n;
  vector<int> v(n);
  for (int i = 0; i < n; i++) {
    cin >> v[i];
  }
  sort(v.begin(), v.end());
  long long ans = 0;
  for (int i = 0; i < n; i++) {
    ans += (long long) abs((i+1)-v[i]);
  }
  cout << ans << endl;
  return 0;
}