#include <iostream>
#include <set>
#include <vector>
#include <string>
#include <algorithm>
#include <iterator>

using namespace std;

#define rep(i, n) for(int i = 0; i < n; i++)
#define repi(i, n) for(auto i = (n).begin(); i != (n).end(); i++)
#define in_arr(type, a, n) copy_n(istream_iterator<type>(cin), n, (a).begin());

int main(){
    int n;
    cin >> n;
    vector<int> a(n);
    in_arr(int, a, n);
    sort(a.begin(), a.end());
    int sum = 0;
    rep(i, n){
        sum += abs(i + 1 - a[i]);
    }
    cout << sum << endl;
    return 0;
}