暴力求解： import java.util.Scanner;
public class Test2{
    public static void main(String agrs[]){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        sc.close();
        int x8=n/8;
        int x6=n/6;
        boolean flag=false;
        for(int i=x8;i>=0;i--){
            for(int j=0;j<=x6;j++){
                if((i*8+j*6)==n){
                    System.out.println(i+j);
                    flag=true;
                    break;
                }
            }
            if(flag){
                break;
            }
        }
        if(!flag)
            System.out.println(-1);
    }
}