2＋1 세일.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Collections;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());

        Integer[] arr = new Integer[n];
        for (int i = 0; i < n; i++) {
            arr[i] = Integer.parseInt(br.readLine());
        }

        Arrays.sort(arr, Collections.reverseOrder());
        int res = 0;
        for (int i = 0; i < n; i++) {
            if (i % 3 != 2) {
                res += arr[i];
            }
        }

        System.out.println(res);
    }
}