using System;

public class Program

{

    public static void Main()

    {

        float toan, ly, hoa, dtb;

        Console.WriteLine("Nhap diem mon toan: ");

        toan = float.Parse(Console.ReadLine());

        Console.WriteLine("Nhap diem mon ly: ");

        ly = float.Parse(Console.ReadLine());

        Console.WriteLine("Nhap diem mon hoa: ");

        hoa = float.Parse(Console.ReadLine());

        dtb = (toan + ly + hoa)/3;

        if (dtb >=5 && toan != 0 && ly!= 0 && hoa !=0)

            Console.WriteLine("Ban da trung tuyen: ");

        else

            Console.WriteLine("Ban khong trung tuyen: ");

    }

}