题解 | #汽水瓶#

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func main() {
	var bottles []int
	inputs := bufio.NewScanner(os.Stdin)
	for inputs.Scan() {
		number, _ := strconv.Atoi(inputs.Text())
		if number == 0 {
			break
		}
		bottles = append(bottles, number)
	}

	for _, bottle := range bottles {
		fmt.Println(sudas(bottle))
	}
}

func sudas(bottle int) int {
	var suda int
	for {
		m := bottle / 3
		if m != 0 {
			suda += m
			bottle = bottle - 2*m
		} else {
			n := bottle % 3
			if n+1 == 3 {
				suda += 1
			}
			break
		}
	}
	return suda
}