#include <bits/stdc++.h>
using namespace std;

int main() {
	int n;
	cin >> n;
	int64_t y[n];
	for (auto &i : y) {
		cin >> i;
	}
	sort(y, y + n);
	if (n % 2) {
		int64_t mid = y[n / 2], ans = 0;
		for (auto &i : y) {
			ans += abs(i - mid);
		}
		cout << ans << endl;
	} else {
		int64_t mid = y[n / 2], ans = 0, puni = 0;
		for (auto &i : y) {
			ans += abs(i - mid);
		}
		mid = y[n / 2 - 1];
		for (auto &i : y) {
			puni += abs(i - mid);
		}
		cout << min(ans, puni) << endl;
	}
	return 0;
}