题解 | #汽水瓶#

import java.util.ArrayList;
import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        ArrayList<Integer> plans = new ArrayList<Integer>();
        while (true) {
            int bottles = Integer.parseInt(in.nextLine());
            if (bottles == 0)break;
            plans.add(bottles);
        }
        ArrayList<Integer> plansResult = new ArrayList<Integer>();
        for (int plane : plans) {
            int total = 0;
            while (plane > 2) {
                int remainde = plane % 3;
                int currentBottle = plane / 3;
                total += currentBottle;
                plane = currentBottle + remainde;
            }
            if (plane == 2) {
                total++;
            }

            plansResult.add(total);
        }
        plansResult.forEach(System.out::println);
    }
}