#include <fstream>
#include <iostream>
#include <vector>
#include <algorithm>
#include <numeric>

int main() {

	//std::ifstream inf("Text.txt");	std::cin.rdbuf(inf.rdbuf());

	int N;
	std::cin >> N;
	std::vector<int> A(N), B(N);

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

	std::sort(A.begin(), A.end());
	std::iota(B.begin(), B.end(), 1);

	int ans = 0;
	for (int i = 0; i < N; i++) {
		ans += std::abs(B[i] - A[i]);
	}

	std::cout << ans << std::endl;

	return 0;
}