#include<bits/stdc++.h>
//#include<atcoder/all>
//using namespace atcoder;
using namespace std;
using ll = long long;

int main(){
	int n;
	cin >> n;
	vector<ll> a(n);
	for(auto &i:a)cin >> i;
	sort(a.begin(),a.end());


	vector<ll> ans;
	for(int j=0;j<2;j++){
		{
			ll A=0,B=0;
			for(int i = 0;i<n/2+1;i++){
				A+= a[i];
			}
			for(int i = n/2+1;i<n;i++){
				B += a[i];
			}
			ans .push_back(abs(A)-abs(B));
		}
		{
			ll A = 0,B=0;
			for(int i = 0;i<n;i++){
				if(i&1)B += a[i];
				else A += a[i];
			}
			ans.push_back(abs(A)-abs(B));
		}
		reverse(a.begin(),a.end());
	}
	cout<<max(min(ans[0],ans[1]),min(ans[2],ans[3]))<<endl;

}