#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <queue>
#include <string>
#include <map>
#include <set>
#include <stack>
#include <tuple>
#include <deque>
#include <array>
#include <numeric>
#include <bitset>
#include <iomanip>
#include <cassert>
#include <chrono>
#include <random>
#include <limits>
#include <iterator>
#include <functional>
#include <sstream>
#include <fstream>
#include <complex>
#include <cstring>
#include <unordered_map>
#include <unordered_set>
using namespace std;

using ll = long long;
constexpr int INF = 1001001001;
// constexpr int mod = 1000000007;
// constexpr int mod = 998244353;

template<class T>
inline bool chmax(T& x, T y){
    if(x < y){
        x = y;
        return true;
    }
    return false;
}
template<class T>
inline bool chmin(T& x, T y){
    if(x > y){
        x = y;
        return true;
    }
    return false;
}

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

    int N;
    cin >> N;
    vector<int> c(N);
    for(int i = 0; i < N; ++i)  cin >> c[i];
    sort(begin(c), end(c));
    
    ll ans = 0;
    ll alice = 0, bob = 0;
    for(int i = 0; i < N / 2; ++i)  bob += c[i];
    for(int i = N / 2; i < N; ++i)  alice += c[i];
    ans = abs(alice) - abs(bob);

    reverse(begin(c), end(c));
    alice = 0, bob = 0;
    for(int i = 0; i < N / 2; ++i)  bob += c[i];
    for(int i = N / 2; i < N; ++i)  alice += c[i];
    chmax(ans, abs(alice) - abs(bob));

    cout << ans << endl;

    return 0;
}