#include<bits/stdc++.h>
using namespace std;
//#define int long long
#define REP(i,m,n) for(int i=(m);i<(n);i++)
#define rep(i,n) REP(i,0,n)
#define pb push_back
#define all(a) a.begin(),a.end()
#define rall(c) (c).rbegin(),(c).rend()
#define mp make_pair
#define endl '\n'
#define vec vector<ll>
#define mat vector<vector<ll> >
#define fi first
#define se second
typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll,ll> pll;
typedef long double ld;
typedef complex<double> Complex;
const ll INF=1e9+7;
const ll inf=INF*INF;
const ll mod=998244353;
const ll MAX=140010;



signed main(){
    ll n;cin>>n;
    vector<ll>c(n);
    rep(i,n)cin>>c[i];
    sort(all(c));
    ll sum1=0,sum2=0;
    rep(i,n/2)sum1+=c[i];
    REP(i,n/2,n)sum2+=c[i];
    ll ans=abs(abs(sum1)-abs(sum2));
    
    sum1=0,sum2=0;
    rep(i,(n+1)/2)sum1+=c[i];
    REP(i,(n+1)/2,n)sum2+=c[i];
    ans=max(ans,abs(abs(sum1)-abs(sum2)));
    cout<<ans<<endl;
}