#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());
	
	/*
	int left = 0;
	int right = N-1;
	
	while(right-left>2){
		int m1 = left + (right-left)/3;
		int m2 = m1 + (right-left)/3;
		
		if(get_score(a,m1)<get_score(a,m2))left = m1;
		else right = m2;
	}
	*/
	long long ans = 0;
	for(int i=0;i<N;i++){
		ans = max(ans,get_score(a,i));
	}
	
	
	
	cout<<ans<<endl;
	
	
    return 0;
}