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

namespace ConsoleApp67
{
    class Weigth
    {
        private double funt;

        public double Funt
        {
            get { return funt; }
            set { funt = value; }
        }

        public double Unc
        {
            get { return funt * 16; }
            set { funt = value / 16; }
        }

        public double Gram
        {
            get { return funt * 453.59237; }
            set { funt = value / 453.59237; }
        }

        private Weigth(double w)
        {
            funt = w;
        }

        public static Weigth CreateFromFunt(double funt)
        {
            return new Weigth(funt);
        }

        public static Weigth CreateFromGram(double funt)
        {
            return new Weigth(funt / 453.59237);
        }

        public static Weigth CreateFromUnc(double funt)
        {
            return new Weigth(funt / 16);
        }

        public override string ToString()
        {
            return $"Funt={Funt:f5} Unc={Unc:f5} Gram={Gram:f5}\n";
        }

        public static Weigth operator +(Weigth t1, Weigth t2)
        {
            return new Weigth(t1.Funt + t2.Funt);
        }

        public static Weigth operator -(Weigth t1, Weigth t2)
        {
            return new Weigth(t1.Funt - t2.Funt);
        }


    }

    class Program
    {
        static void Main(string[] args)
        {
            Weigth w1, w2, w3;
            w1 = Weigth.CreateFromFunt(40);
            w2 = Weigth.CreateFromGram(10);
            w3 = Weigth.CreateFromUnc(20);

            Console.WriteLine(w1);
            Console.WriteLine(w2);
            Console.WriteLine(w3);
            Console.WriteLine(w2 - w1);
            Console.WriteLine(w1 + w3);
        }
    }
}