题解 | 买橘子

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n=sc.nextInt();
        int count=0;	//袋数
        while(n>0){
            n-=6;		//每次减六
            count++;	
            if(n%8==0){
                count+=n/8;
                n=0;
                break;
            }
        }
        if(n!=0){
            System.out.println(-1);
        }
        else{
            System.out.println(count);
        }
    }
}