#include <cmath> #include <iostream> #include <algorithm> using namespace std; int n, a[55]; int main() { cin >> n; for (int i = 0; i < n; i++) cin >> a[i]; sort(a, a + n); int sum = 0; for (int i = 0; i < n; i++) sum += abs(a[i] - (i + 1)); cout << sum << '\n'; return 0; }