#include <iostream> #include <algorithm> #include <vector> #include <string> using namespace std; int main() { int n; cin >> n; vector<int> a(n); for (int i = 0; i < n; i++) { cin >> a[i]; } sort(a.begin(), a.end()); long long ans = 0; for (int i = 0; i < n; i++) { ans += abs(a[i] - a[n / 2]); } cout << ans << endl; }