using System;
using System.Collections.Generic;

class Triangle : IComparable<Triangle>
{
	public Triangle(double side, double h)
	{
		this.SideA = side;
		this.H = h;
		this.Surface = this.FindSurfaceBySideAndH();
	}

	public Triangle(double sideA, double sideB, double sideC)
	{
		this.SideA = sideA;
		this.SideB = sideB;
		this.SideC = sideC;
		this.Surface = this.FindSurfaceByThreeSides();
	}

	public double SideA { get; protected set; }
	public double SideB { get; protected set; }
	public double SideC { get; protected set; }
	public double H { get; protected set; }
	public double Surface { get; protected set; }

	private double FindSurfaceBySideAndH()
	{
		return (SideA * H) / 2;
	}

	protected double FindSurfaceByThreeSides()
	{
		double p = (SideA + SideB + SideC) / 2;

		return Math.Sqrt(p * (p - SideA) * (p - SideB) * (p - SideC));
	}

	public int CompareTo(Triangle other)
	{
		return other.Surface.CompareTo(Surface);
	}

	public override string ToString()
    {
		if (SideA > 0 && SideB > 0 && SideC > 0)
		{
			return String.Format("a = {0}, b = {1}, c = {2}, S = {3}",
			                     SideA, SideB, SideC, Surface);
		}

		return String.Format("a = {0}, h = {1}, S = {2}",
		                     SideA, H, Surface);
    }
}

class Pyramid : Triangle
{
	public Pyramid(double sideA, double sideB, double sideC, double h)
		: base(sideA, sideB, sideC)
	{
		this.FindSurfaceByThreeSides();
		this.H = h;

		this.Volume = this.FindVolume();
	}

	public double Volume { get; private set; }

	private double FindVolume()
	{
		return this.Surface * H / 3;
	}

	public int CompareTo(Pyramid other)
	{
		return other.Volume.CompareTo(this.Volume);
	}

	public override string ToString()
    {
		return String.Format("a = {0}, b = {1}, c = {2}, h = {3}, V = {4}",
		                     SideA, SideB, SideC, H, this.Volume);
    }
}

public class Program
{
	public static void Main(string[] args)
	{
//		List<Triangle> list = new List<Triangle>();
//		list.Add(new Triangle(7, 3));
//		list.Add(new Triangle(3, 4, 5));
//		list.Add(new Triangle(8, 5));
//
//		list.Sort();
//
//		Console.WriteLine(String.Join("\n\n", list));
//
//		Console.WriteLine();

		List<Pyramid> listOfPyramids = new List<Pyramid>();
		listOfPyramids.Add(new Pyramid(2, 3, 5, 9));
		listOfPyramids.Add(new Pyramid(3, 4, 5, 8));
		listOfPyramids.Add(new Pyramid(1, 3, 5, 10));

		listOfPyramids.Sort();

		Console.WriteLine(String.Join("\n\n", listOfPyramids));
	}
}