using System;

class Point{
   Int32 x;
   Int32 y;

   public Int32 X{
      get{return x;}
      set{x = value;}
   }   
   
   public Int32 Y{
      get{return y;}
      set{y = value;}
   }
}

class App{
   public static void Main(){
      Point p = new  Point();
      p.X = 10;
      p.Y = p.X+5;
      Console.WriteLine(p.Y);
   }
}

/* Other code used in figures in the tutorial
class Point{
   Int32 x;
   Int32 y;

   public Point():this(0, 0){}
   public Point(Int32 x, Int32 y){
      this.x = x;
      this.y = y;
   }

   public Int32 X{
      get{return x;}
      set{x = value;}
   }

   public Int32 Y{
      get{return y;}
      set{y = value;}
   }
}

class NamedPoint:Point{
   String name;

   public NamedPoint(String name):this(name, 0, 0){}
   public NamedPoint(String name, Int32 x, Int32 y):base(x, y){
      this.name = name;
   }

   public String Name{
      get{return name;}
   }
}
//*/