只写出一道题的蒟蒻、、、

[逐鹿轻]

import java.util.Scanner;

public class day1 {
    static int num = 0;
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        num = sc.nextInt();  //将一开始买的瓶数加进去总数
        account(num);
        System.out.println(num);
    }
    public static void account(int n) {
        if(n>=3) {
            num+=n/3;     //每次换的瓶数加上去
            n=n/3+n%3;       //得出瓶盖数
            account(n);          //递归
        }
    }
}