#include <bits/stdc++.h>
using namespace std;
void solve() {
  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 moves = 0;
  for (long long i = 0; i < n; i++) {
    if (a[i] < 1) {
      moves = moves + (i + 1) - a[i];
    } else if (a[i] > n) {
      moves = moves + (a[i] - (i + 1));
    } else if (a[i] > (i + 1)) {
      moves = moves + (a[i] - (i + 1));
    } else {
      moves = moves + (i + 1 - a[i]);
    }
  }
  cout << moves;
}
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  long long t = 1;
  while (t--) {
    solve();
    cout << "\n";
  }
  cerr << "time taken: " << (float)clock() / CLOCKS_PER_SEC << endl;
  return 0;
}
