#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int n;cin>>n;
  vector<int> hoge(n);rep(i,n)cin>>hoge[i];
  sort(hoge.begin(),hoge.end());
  int cnt=0;
  rep(i,n){
    if(hoge[i]<i+1)cnt+=i+1-hoge[i];
    else if(hoge[i]>i+1)cnt+=hoge[i]-(i+1);
  }
  cout<<cnt<<endl;
}