#include<iostream>
#include<string>
#include<algorithm>
#include<functional>
#include<vector>
#include<set>
#include<queue>
#include<list>
#include<stdio.h>
#include<stdlib.h>
#include<map>

#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define fore(i,a) for(auto &i:a)
#define all(x) (x).begin(),(x).end()

using namespace std;

int main() {
	
	int N;
	cin >> N;

	vector<int> a(N);

	for (int i = 0; i < N; i++) {
		int buf;
		cin >> buf;

		a[i] = buf;
	}

	sort(a.begin(), a.end());

	int ans = 0;
	for (int i = 0; i < N; i++) {
		ans += abs(a[i] - (i + 1));
	}

	cout << ans << endl;

}