#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x+modulo))%modulo)
#define Inf 10000000.0

long long get_score(vector<long long> &a,int m){
	if(m>=a.size()||m<0)return 0;
	long long ret = 0;
	
	long long S = 0;
	
	for(int i=m-1;i>=0;i--){
		S += a[i];
		S += a[a.size()-1 - (m-1-i)];
		S -= 2*a[m];
		ret = max(ret,S);
	}
	
	return ret;
}


int main(){
	
	int N;
	cin>>N;
	
	vector<long long> a(N);
	for(int i=0;i<N;i++){
		cin>>a[i];
	}
	
	sort(a.begin(),a.end());
	
	long long ans = -1;
	int ind;
	
	for(int i=0;i<N;i+=1000){
		long long s = get_score(a,i);
		if(s>ans){
			ans = s;
			ind = i;
		}
	}
	
	for(int i=ind-500;i<=ind+500;i++){
		ans = max(ans,get_score(a,i));
	}
	
	
	cout<<ans<<endl;
	
	
    return 0;
}