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using System;

namespace Test4
{
    class X {
        protected int x;
        public X(int x) {
            this.x = x;
        }
        public virtual void foo() {
            Console.WriteLine(x);
        }
    }
    class Y : X
    {
        int y;
        public Y(int x1,int x2) : base(x1) {
            y = x2;
        }
        public override void foo() {
            Console.WriteLine(y);
            base.foo();
        }
    }
    class Z : X
    {
        int z;
        public Z(int x1,int x2) : base(x1) {
            z = x2;
        }
        public override void foo() {
            Console.WriteLine(z);
            base.foo();
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            int[] data = { 1, 2, 3, 4, 5 };

            X []arr = new X[3];
            arr[0] = new X(data[0]);
            arr[1] = new Y(data[1],data[2]);
            arr[2] = new Z(data[3],data[4]);
            for (int i = 0; i < arr.Length; i++)
                arr[i].foo();
        }
    }
}