#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 110000

signed main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	cout<<fixed<<setprecision(10);
	
	int N;
	static int Y[MAX], dp[MAX];
	
	cin>>N;
	
	for(int i = 0; i < N; i++){
		cin>>Y[i];
	}
	
	sort(Y, Y + N);
	
	dp[1] = INF;
	dp[2] = dp[0] + Y[1] - Y[0];
	
	for(int i = 2; i < N; i++){
		dp[i+1] = dp[i-1] + Y[i] - Y[i-1];
		dp[i+1] = min(dp[i+1], dp[i-2] + Y[i] - Y[i-1] + Y[i-1] - Y[i-2]);
	}
	
	cout<<dp[N]<<endl;
	
	return 0;
}