import java.util.*;

public class Akcija {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int n = sc.nextInt();

int[] prices = new int[n];

int index;

//add all the prices into the array

for(int i=0; i<n; i++){

index = sc.nextInt();

prices[i] = index;

}

//sort the array

Arrays.sort(prices);

int sum = 0;

int counter = 0;

for(int i = prices.length-1; i>=0; i--){

if(counter < 2){

sum+= prices[i];

counter++;

}

else{

counter = 0;

continue;

}

}

System.out.println(sum);

}

}