#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <cassert>

#define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl;
#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

using namespace std;
typedef long long ll;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    int n; cin >> n;
    vector<ll> c(n);
    for(int i = 0; i < n; i++) cin >> c[i];
    sort(c.begin(), c.end());
    ll ansl = -1, ansr = -1;
    // ++
    {
        ll l = 0, r = 0;
        for(int i = 0; i < n; i++){
            if(i%2 == 0) l += c[n-i-1];
            else r += c[n-i-1];
        }
        ansl = abs(l)-abs(r);
    }
    // +-
    {
        ll l = 0, r = 0;
        for(int i = 0; i < n; i++){
            if(i*2 < n) l += c[n-i-1];
            else r += c[n-i-1];
        }
        chmin(ansl, abs(l)-abs(r));
    }
    // -+
    {
        ll l = 0, r = 0;
        for(int i = 0; i < n; i++){
            if(i*2 < n) l += c[i];
            else r += c[i];
        }
        ansr = abs(l)-abs(r);
    }
    // --
    {
        ll l = 0, r = 0;
        for(int i = 0; i < n; i++){
            if(i%2 == 0) l += c[i];
            else r += c[i];
        }
        chmin(ansr, abs(l)-abs(r));
    }
    cout << max(ansl, ansr) << endl;
}