#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());
	ll l = 0,r=0;
	for(int i = 0;i<n;i++)if(i<n/2+1)l+=a[i];else r+=a[i];

	if(abs(l)<abs(r)){
		reverse(a.begin(),a.end());
	}
	ll ans = LLONG_MAX;
	{
		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 = 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 = min(ans,abs(A)-abs(B));
	}
	cout<<ans<<endl;
}