#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int N;
  cin >> N;
  vector<int> Y(N);
  for (auto &&e : Y) {
    cin >> e;
  }
  sort(Y.begin(), Y.end());
  int64_t res = 0;
  if (N % 2 == 0) {
    int64_t a = 0, b = 0;
    for (auto &&e : Y) {
      a += abs(e - Y[N / 2]);
      b += abs(e - Y[N / 2 - 1]);
    }
    res = min(a, b);
  } else {
    for (auto &&e : Y) {
      res += abs(e - Y[N / 2]);
    }
  }
  cout << res << '\n';
  return 0;
}