using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication49
{
    class Program
    {
        static void Main(string[] args)
        {
            List <DrawingTool> tools = new List<DrawingTool>();

            DrawingTool pencil = new Pencil();
            tools.Add(pencil);
            DrawingTool brush = new Brush();
            tools.Add(brush);
            DrawingTool eraser = new Eraser();
            tools.Add(eraser);

            Console.WriteLine(tools[0].GetToolSize());

        }
    }

    abstract class DrawingTool
    {
        public virtual int GetToolSize()
        {
            return 0;
        }

        public virtual string GetColor()
        {
            return null;
        }

        public virtual string GetToolInfo()
        {
            return null;
        }

    }

    class Pencil : DrawingTool
    {
        public override int GetToolSize()
        {
                return 1;
        }
    }

    class Brush : DrawingTool
    {
        public override int GetToolSize()
        {
                return 6;
        }
    }

    class Eraser : DrawingTool
    {
        public override int GetToolSize()
        {
                return 3;
        }
    }



}