#include<bits/stdc++.h>
using namespace std;
typedef long long ll;

 
signed main(){
    //cout << setprecision(12) ;
    ios::sync_with_stdio(false);
	cin.tie(0);

    ll n;
    cin>>n;
    ll h[n];
    for(int i=0;i<n;i++){
        cin>>h[i];
    }
    sort(h,h+n);
    ll dp[n+1][4]={};
    dp[0][1]=1e18;
    
    
    for(int i=0;i<n;i++){
        dp[i+1][0] = dp[i][1];
        if(i+1<n) dp[i+1][1] = min(dp[i][0],dp[i][2]) + h[i+1]-h[i];
        if(i) dp[i+1][2] = min(dp[i][0],dp[i][3]) + h[i]-h[i-1];
        else dp[i+1][2] = 1e18;
        dp[i+1][3] = min(dp[i][0],min(dp[i][1],dp[i][2]));
        //cerr<<i<<" "<<dp[i+1][0]<<" "<<dp[i+1][1]<<" "<<dp[i+1][2]<<" "<<dp[i+1][3]<<endl;
    }
    ll ans = min(dp[n][0],dp[n][2]);
    //cerr<<dp[n][0]<<" "<<dp[n][2]<<endl;
    cout<<ans<<endl;


    
}