using System;

namespace Prov
{
    public class A
    {
        public int a = 5, b = 5, i = 0;
        public int c
        {
            get
            {
                a += a;
                --b;
                i++;
                return
                    i * (a - b);
            }
            set
            {
                c = value;
            }
        }
    }
    class programm
    {
        public static void Main()
        {
            B myB = new B();
            for (int i = 0; i < myB.k; i++)
            {
                Console.WriteLine(myB[i]);
            }
            Console.WriteLine(C.St.x);
            Console.ReadLine();
        }
    }
    public class B : A
    {
        public int[] mass;
        public int k;
        public B() : base()
        {
            mass = new int[a];
            k = a;
        }
        public int this[int i]
        {
            get
            {
                return c;
            }
            set
            {
                mass[i] = value;
            }
        }        
    }
    public class C
    {
        public struct St
        {
            public static int x = 20;
        }

    }
}