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

int main()
{
    int n;
    cin >> n;
    vector<int> y(n);
    for (int i = 0; i < n; i++) cin >> y.at(i);
    sort(y.begin(), y.end());
    int dmax = 0, dmaxi = 0;
    for (int i = 0; i < n - 1; i++) {
        int d = y.at(i + 1) - y.at(i);
        if (d > dmax) {
            dmax = d;
            dmaxi = i;
        }
    }
    if (dmax == 0) {
        cout << 1 << endl;
        return 0;
    }
    long dsum = 0, yformer = y.at(n / 4), ylatter = y.at(3 * n / 4);
    for (int i = 0; i < n / 2; i++) dsum += abs(y.at(i) - yformer);
    for (int i = n / 2; i < n; i++) dsum += abs(y.at(i) - ylatter);
    cout << dsum << endl;
}