[BOJ] 11508 2+1 세일 (JAVA)

https://www.acmicpc.net/problem/11508

11508번: 2+1 세일

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;

public class Main {
	
    public static void main(String[] args) throws Exception {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(br.readLine());
        int[] input = new int[N];
        for (int i = 0; i < N; i++) {
            input[i] = Integer.parseInt(br.readLine());
        } // end of input

        Arrays.sort(input);
        int three = 0;
        int sum = 0;
        for (int i = N - 1; i >= 0; i--) {
            if (++three == 3) three = 0;
            else sum += input[i];
        }

        System.out.print(sum);

    }

}