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

using ll = long long;
#define rep(i,n) for(ll i=0;i<ll(n);i++)
#define all(A) A.begin(),A.end()
using vll = vector<ll>;
using vvll = vector<vll>;
using vvvll = vector<vvll>;
using vvvvll = vector<vvvll>;
using vb = vector<bool>;
using vvb = vector<vb>;
using vvvb = vector<vvb>;
using vvvvb = vector<vvvb>;

bool DEB = 0;
int main() {
    ll N;
    cin>>N;
    vll C(N);
    rep(i,N)cin>>C[i];
    ll an=-1e18;
    ll res=0,fes;
    sort(all(C));
    rep(t,2){
        res=0,fes=0;
        rep(i,N){
        
        if(i%2==0)res+=C[i];
        else fes+=C[i];
        }
        an=max(an,abs(res)-abs(fes));
        reverse(all(C));
    }
    cout<<an<<endl;
}