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

int main() {
  int N;
  cin >> N;
  vector<int> A(N);
  for (int i = 0; i < N; i++) cin >> A.at(i);
  sort(A.begin(), A.end());
  int sum = 0;
  for (int i = 0; i < N; i++) sum += abs(A.at(i) - (i + 1));
  cout << sum << "\n";
}