// No.609 Noelちゃんと星々
// https://yukicoder.me/problems/no/609
//

#include <iostream>
#include <vector>
#include <cmath>
#include <algorithm>
using namespace std;

long long solve(vector<int> &stars);
long long calc_score(int n, vector<int>& stars);


int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    unsigned int N;
    cin >> N;
    vector<int> stars(N);
    for (auto i = 0; i < N; ++i)
        cin >> stars[i];
    long long ans = solve(stars);
    cout << ans << endl;
}

long long calc_score(int n, vector<int>& stars) {
    long long ans = 0;
    for (auto s: stars) {
        ans += abs(s - n);
    }
    return ans;
}


long long solve(vector<int> &stars) {
    int ub = *max_element(stars.begin(), stars.end());
    int lb = *min_element(stars.begin(), stars.end());

    for (auto i = 0; i < 100; ++i) {
        int mid1 = (lb * 2 + ub) / 3;
        long long mid1_score = calc_score(mid1, stars);
        int mid2 = (lb + ub * 2) / 3;
        long long mid2_score = calc_score(mid2, stars);

        if (mid2_score > mid1_score)
            ub = mid2;
        else
            lb = mid1;
    }

    long long ans = pow(2, 60);
    for (int i = lb; i <= ub; ++i) {
        long long t = calc_score(i, stars);
        ans = min(ans, t);
    }
    return ans;
}