#include <cstdio>
#include <vector>
#include <cmath>
#include <algorithm>

using namespace std;

int main() {
	int N;
	int sum = 0;
	scanf("%d", &N);
	vector <int> a(N);
	for (int i = 0; i<N; i++)scanf("%d", &a[i]);
	sort(a.begin(),a.end());
	for(int i=0;i<N;i++){
	    sum += abs(a[i]-i);
	}
	printf("%d\n", sum);
	return 0;
}