#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

int N, ans;
int A[55];

int main() {
  cin >> N;
  for (int i = 1; i <= N; i++) cin >> A[i];
  sort(A + 1, A + N + 1);
  for (int i = 1; i <= N; i++) ans += abs(A[i] - i);
  cout << ans << endl;
  return 0;
}