#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main(int argc, char* argv[])
{
	int N;
	cin>>N;
	vector<int> val(N+1);
	int ans=0;
	int x;
	int i;
	for (i=1;i<=N;i++){
		cin>>val[i];
	}
	sort(val.begin(),val.end());
	for (i=1;i<=N;i++){
		x=i-val[i];
		if (x<0){
			x=-x;
		}
		ans+=x;
	}
	cout<<ans<<endl;
	return 0;
}