using System;

public class Program

{

    public static void Main()

    {

    HinhChuNhat hcn=new HinhChuNhat();

        hcn.Nhap();

        hcn.Xuat();

        Console.WriteLine("Chu Vi Hinh Chu Nhat la :"+hcn.ChuViHinhChuNhat());

        Console.WriteLine("Dien Tich Hinh Chu Nhat la :"+hcn.DienTichHinhChuNhat());

    }

    class HinhChuNhat

    {

        private int a;

        private int b;

        public void Nhap()

        {

            Console.WriteLine("Nhap So a :");

            a=int.Parse(Console.ReadLine());

            Console.WriteLine("Nhap So b :");

            b=int.Parse(Console.ReadLine());

        }

        public void Xuat()

        {

            Console.WriteLine("do dai canh a :",a);

            Console.WriteLine("do dai canh b :",b);

        }

        public int ChuViHinhChuNhat()

        {

            int c;

            c= ( a + b)*2;

            return c;

        }

            public int DienTichHinhChuNhat()

            {

                int s;

                s = a*b;

                return s;

            }

    }

}