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

int main()
{
    int n;
    cin >> n;
    int a[n];
    for (auto &i : a)
    {
        cin >> i;
    }
    sort(a, a + n);
    int ans = 0;
    for (int i = 0; i < n; i++)
    {
        ans += abs(i + 1 - a[i]);
    }
    cout << ans << endl;
    return 0;
}