#include<iostream>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<algorithm>

using namespace std;

#define int long long
#define rep(i,n) for(int i = 0; i < (n); i++)
#define endl "\n"

const long long INF = (long long)1e18;
const long long MOD = (long long)1e9 + 7; 

string yn(bool f){return f?"Yes":"No";}
string YN(bool f){return f?"YES":"NO";}

#define MAX

signed main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	cout<<fixed<<setprecision(10);
	
	int N;
	vector<int> Y;
	int ans = 0;
	int mi = 0, con = 0;
	
	cin>>N;
	
	Y.resize(N);
	
	for(int i = 0; i < N; i++){
		cin>>Y[i];
	}
	
	sort(Y.begin(), Y.end());
	
	ans += Y[1] - Y[0];
	mi = Y[1];
	con = 2;
	
	for(int i = 1; i < N-1; i++){
		if(i == N-2) ans += Y[N-1] - Y[i];
		else {
			if(con == 1){
				ans += Y[i] - mi;
				con++;
			} else {
				if(Y[i] - mi < Y[i+1] - Y[i]){
					ans += Y[i] - mi;
					con++;
				} else {
					ans += Y[i+1] - Y[i];
					mi = Y[i+1];
					con = 0;
				}
				
			}
		}
		// cout<<mi<<" "<<ans<<endl;
	}
	
	cout<<ans<<endl;
	
	return 0;
}