#include <bits/stdc++.h>
using namespace std;
long long int sum;
vector<int> x;
int main() {
  int n;
  cin >> n;
  x.push_back(-2099999999);
  for (int i = 0; i < n; i++) {
    int a;
    cin >> a;
    x.push_back(a);
  }
  sort(x.begin(), x.end());
  for (int i = 1; i <= n; i++) sum += abs(i - x[i]);
  cout << sum << endl;
}
