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