#include<bits/stdc++.h>

#define INF 1000000007
#define LINF 1000000000000000007

using namespace std;

typedef long long ll;
typedef pair<ll, ll> P;

int n, a[50];

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