#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
#define rep(i,s,e) for(int (i) = (s);(i) <= (e);(i)++)

int main(){
  int N;
  cin >> N;
  vector<i64> A(N);

  rep(i,0,N - 1) cin >> A[i];
  sort(begin(A),end(A));
  int ans = 0;
  rep(i,0,N - 1){
    ans += abs(i + 1 - A[i]);
  }

  cout << ans << endl;
}