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

int main()
{
	int N;
	cin >> N;
	vector<int> A( N );
	for( int i = 0; i < N; i++ ) {
		cin >> A[i];
	}

	sort( A.begin(), A.end() );
	int ans = 0;
	for( int i = 0; i < N; i++ ) {
		int n = i + 1;
		ans += abs( n - A[i] );
	}

	cout << ans << endl;
}