#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;
using ll = long long;

int main() {
    int n;
    cin >> n;

    vector<int> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
        a[i]--;
    }

    sort(a.begin(), a.end());

    int r = 0;
    for (int i = 0; i < n; i++) {
        r += abs(a[i] - i);
    }

    cout << r << endl;

    return 0;
}