#include<bits/stdc++.h>
using namespace std;

int main(){
    int n,in,ans=0;
    vector<int> v;
    cin >> n;
    while(cin >> in) v.push_back(in);
    sort(v.begin(),v.end());
    for(int i=0;i<n;i++) ans+=(v[i]>i+1)?v[i]-i-1:i+1-v[i];
    cout << ans << endl;
    return 0;
}