#include <bits/stdc++.h>

using namespace std;

int main() {
  int N;
  scanf("%d", &N);
  vector<int> A(N);
  for (int i = 0; i < N; ++i) scanf("%d", &A[i]);

  sort(A.begin(), A.end());
  int ans = 0;
  for (int i = 0; i < N; ++i) {
    ans += abs(A[i] - (i + 1));
  }

  printf("%d\n", ans);
  return 0;
}