#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, dp;
	
	cin>>N;
	
	Y.resize(N);
	dp.resize(N+1);
	
	for(int i = 0; i < N; i++){
		cin>>Y[i];
	}
	
	sort(Y.begin(), Y.end());
	
	for(int i = 0; i < N; i++){
		// dp[i+1] = dp[i];
		if(i < 1) dp[i+1] = INF;
		if(i >= 1) dp[i+1] = dp[i-1] + abs(Y[i] - Y[i-1]);
		if(i >= 2) dp[i+1] = min(dp[i+1], dp[i-2] + abs(Y[i] - Y[i-1]) + abs(Y[i-2] - Y[i-1]));
		// cout<<"i = "<<i<<" "<<dp[i+1]<<endl;
	}
	
	cout<<dp[N]<<endl;
	
	return 0;
}