#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define ALL(v) v.begin(),v.end()
typedef long long ll;

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

int main(){
  int n;
  cin>>n;
  
  vector<ll> C(n);
  ll sum=0;
  rep(i,n){
    ll x;
    cin>>x;
    sum+=x;
    C[i]=x;
  }
  sort(ALL(C));
  
  ll sum1=0,sum2=0,sum3=0,sum4=0;
  rep(i,(n+1)/2){
    sum1+=C[i];
    sum2+=C[n-1-i];
    sum3+=C[2*i];
    sum4+=C[n-1-2*i];
  }
  
  ll ma=max({abs(sum1)-abs(sum-sum1),abs(sum2)-abs(sum-sum2),abs(sum3)-abs(sum-sum3),abs(sum4)-abs(sum-sum4)});
  cout<<ma<<endl;
  
  return 0;
}