#include <iostream>
#include <algorithm>

using namespace std;

int main() {
    int N;
    int cnt = 0;
    cin >> N;
    int A[N];
    for (int i = 0; i < N; i++) {
        cin >> A[i];
    }
    sort(A, A + N);
    for (int i = 0; i < N; i++) {
        cnt += abs(A[i] - (i+1));
    }
    cout << cnt << endl;
}