#include <bits/stdc++.h>
using namespace std;

int A[ 60 ];

int main()
{
int i;
int N;
int iSum;

	ios::sync_with_stdio( false );
	cin.tie( 0 );

	cin >> N;

	for( i = 1; i <= N; i++ ) cin >> A[ i ];

	sort( A + 1, A + N + 1 );

	iSum = 0;
	for( i = 1; i <= N; i++ )
	{
		iSum += abs( A[ i ] - i );
	}

	cout << iSum << endl;

	return 0;
}