Card game

import java.util.Arrays;
import java.util.Scanner;

public class CardGame {
	
	public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int[] cards = new int[scan.nextInt()];
        
        for(int i = 0; i < cards.length; i++) {
        	cards[i] = scan.nextInt();
        }
        
        Arrays.sort(cards);
        long sum = 0;
        for(int i = cards.length-1; i>1; i -=3) {
        	sum += cards[i-1] + cards[i-2];
        }
        
        System.out.println(sum);
	}
	

}

Test 1

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Test 2

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Test 3

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Test 4

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Test 5

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Test 6

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Test 7

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Test 8

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Test 9

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Test 10

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Test 11

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Test 12

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Test 13

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Test 14

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Test 15

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Test 16

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Test 17

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Test 18

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