#include<iostream>
#include<vector>
#include<algorithm>
#include<cstdlib>
using namespace std;

int main(){
	//iotreamの高速化
	cin.tie(0),ios::sync_with_stdio(false);
	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 = 1; i <= N; i++) {
        ans += abs(A[i-1] - i);
    }
    cout << ans << endl;

	return 0;
}