#include<stdio.h>
#include<iostream>
#include<vector>
#include<cstdlib>
#include<algorithm>
using namespace std;

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