using System;
using System.Collections.Generic;

// Lop co so
class NGUOI
{
    public string Hoten { get; set; }
    public string Diachi { get; set; }
    public int Tuoi { get; set; }

    // Constructor khong tham so
    public NGUOI()
    {
        Hoten = "";
        Diachi = "";
        Tuoi = 0;
    }

    // Constructor co tham so
    public NGUOI(string hoten, string diachi, int tuoi)
    {
        Hoten = hoten;
        Diachi = diachi;
        Tuoi = tuoi;
    }

    // Phuong thuc nhap thong tin
    public virtual void Input()
    {
        Console.Write("Nhap ho ten: ");
        Hoten = Console.ReadLine();

        Console.Write("Nhap dia chi: ");
        Diachi = Console.ReadLine();

        Console.Write("Nhap tuoi: ");
        Tuoi = int.Parse(Console.ReadLine());
    }

    // Phuong thuc hien thi thong tin
    public virtual void Show()
    {
        Console.WriteLine($"Ho ten: {Hoten}, Dia chi: {Diachi}, Tuoi: {Tuoi}");
    }
}

// Lop dan xuat SINHVIEN ke thua NGUOI
class SINHVIEN : NGUOI
{
    public string MaSV { get; set; }
    public double DiemTB { get; set; }

    // Constructor khong tham so
    public SINHVIEN() : base()
    {
        MaSV = "";
        DiemTB = 0;
    }

    // Constructor co tham so
    public SINHVIEN(string hoten, string diachi, int tuoi, string masv, double diemtb)
        : base(hoten, diachi, tuoi)
    {
        MaSV = masv;
        DiemTB = diemtb;
    }

    // Ghi de phuong thuc nhap
    public override void Input()
    {
        base.Input();
        Console.Write("Nhap ma sinh vien: ");
        MaSV = Console.ReadLine();

        Console.Write("Nhap diem trung binh: ");
        DiemTB = double.Parse(Console.ReadLine());
    }

    // Ghi de phuong thuc hien thi
    public override void Show()
    {
        base.Show();
        Console.WriteLine($"Ma SV: {MaSV}, Diem TB: {DiemTB}");
    }
}

// Lop chay chuong trinh chinh
class Program
{
    static void Main()
    {
        Console.Write("Nhap so luong sinh vien: ");
        int n = int.Parse(Console.ReadLine());

        List<SINHVIEN> danhSach = new List<SINHVIEN>();

        for (int i = 0; i < n; i++)
        {
            Console.WriteLine($"\nNhap thong tin sinh vien thu {i + 1}:");
            SINHVIEN sv = new SINHVIEN();
            sv.Input();
            danhSach.Add(sv);
        }

        Console.WriteLine("\n=== Danh sach sinh vien vua nhap ===");
        foreach (SINHVIEN sv in danhSach)
        {
            sv.Show();
            Console.WriteLine();
        }

        Console.ReadLine();
    }
}