#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
#define INF (1<<30)
#define INFLL (1ll<<60)
typedef pair<double, int> P;
typedef pair<int, P> E;
#define MOD (1000000007ll)
#define l_ength size
#define EPS (1e-10)

void add_mod(ll &a, ll b){
	a += b;
	a %= MOD;
}

void mul_mod(ll &a, ll b){
	a *= b;
	a %= MOD;
}

string s;
stack<int> t;
int p[123];

int calc(int l, int r){
	int ret=0,d=1,v,i;
	for(i=l; i<=r; ++i){
		if(s[i] == '+'){
			d = 1;
			continue;
		}else if(s[i] == '-'){
			d = -1;
			continue;
		}
		if(s[i] == '('){
			v = calc(i+1,p[i]-1);
			i = p[i];
		}else{
			v = s[i]-'0';
		}
		ret += d*v;
	}
	return ret;
}

int main(void){
	int n,a[123456],i,ans=0;
	cin >> n;
	for(i=0; i<n; ++i){
		cin >> a[i];
		--a[i];
	}
	sort(a,a+n);
	for(i=0; i<n; ++i){
		ans += abs(a[i]-i);
	}
	cout << ans << endl;
	return 0;
}