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

namespace ConsoleApplication3
{
    public class Prosta
    {
        protected int x;


        public Prosta(int xx)
        {
            x = xx;
        }

        public virtual void odl_zero()
        {
            Console.WriteLine(Math.Abs(x));
        }

        public class Plaszczyzna : Prosta
        {
            protected int y;

            public Plaszczyzna(int xx, int yy)
                : base(xx)
            {
                y = yy;
            }

            public override void odl_zero()

            {
                Console.WriteLine(Math.Sqrt(x * x + y * y));

            }
        }
    }
}