#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
using namespace std;


int main()
{
    int n, cnt = 0;
    cin >> n;
    vector<int> v;
    for (int i = 0; i < n; i++){
        int t;
        cin >> t;
        v.push_back(t);
    }
    sort(v.begin(), v.end());
    for (int i = 0; i < n; i++){
        cnt += abs(v[i] - (i+1));
    }
    cout << cnt << endl;
}