#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<cmath>
#include<stdio.h>
#include<queue>
#include <climits>
const int mod = 1e9 + 7;
const int INF = 1e9;
using namespace std;
typedef long long ll;

int main()
{
    int n;
    cin >> n;
    vector<int> v(n);
    int ans = 0;
    for(int i = 0; i < n; i++){
        cin >> v[i];
    }
    sort(v.begin(),v.end());
    for(int i = 1; i < n+1 ;i++){
        ans += abs(v[i] - i);
    }
    cout << ans;
}