#include<iostream>
#include<cmath>
#include<algorithm>
using namespace std;

int main(){
    int n,a[55];
    cin >> n;
    for(int i=0;i < n;i++) cin >> a[i];
    sort(a,a + n);
    int sum = 0;
    for(int i=0;i < n;i++) sum += abs(i + 1 - a[i]);
    cout << sum << endl;
    return 0;
    }