汽水瓶 （Java代码）

解题思路:

注意事项:

参考代码:

import java.util.Scanner;

public class Main{

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

while (sc.hasNext()) {

int m = sc.nextInt();

int n = 0;

while (m!=0) {

int f = m / 3;

n = n + f;

m = f + m % 3;

if (m ==2) {

System.out.println(n + 1);

break;

} 

if(m==1){

System.out.println(n);

break;

}

}

}

}

}