using System;

public class Program

{

    class Rectangle{

        public double width{get;set;}

        public double height{get;set;}

      //constructor

        public Rectangle()

         {

           width=3;

           height=2;

         }

        public Rectangle(double w, double h)

          {

             width = w;

             height = h;

          }

         public double area()

          {

             return width * height;

          }

    }

    public static void Main()

    {

        Rectangle a=new Rectangle(3,5);

        Console .WriteLine(a.area());

    }

}