using System;

public class Program

{

    public static void Main()

    {

        Console.Write("Nhap toa do x: ");

        double x = double.Parse(Console.ReadLine());

        Console.Write("Nhap toa do y: ");

        double y = double.Parse(Console.ReadLine());

        if (x==0 && y!=0)

            Console.WriteLine("\n Diem nam tren truc tung");

        if (x!=0 && y==0)

            Console.WriteLine("\n Diem nam tren truc hoanh");

        if (x==0 && y==0)

            Console.WriteLine("\n Diem thuoc goc toa do");

        else if (x>0 && y<0)

            Console.WriteLine("\n Diem thuoc Q4");

        else if (x<0 && y<0)

            Console.WriteLine("\n Diem thuoc Q3");

        else if (x<0 && y>0)

            Console.WriteLine("\n Diem thuoc Q2");

        else if (x>0 && y>0)

            Console.WriteLine("\n Diem thuoc Q1");

        Console.ReadLine();

    }

}