#include <iostream> #include <vector> #include <string> #include <algorithm> #include <cstdio> #include <cstring> #include <cmath> using namespace std; using ll = long long; int main() { int n; cin >> n; vector<int> a(n); for (int i = 0; i < n; i++) { cin >> a[i]; a[i]--; } sort(a.begin(), a.end()); int r = 0; for (int i = 0; i < n; i++) { r += abs(a[i] - i); } cout << r << endl; return 0; }