using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.IO;

namespace ConsoleApplication33

{

    class Program

    {

        static void Main(string[] args)

        {

            double f = 0;

            var path = @"C:/Users/davla/Desktop/4.tif";

            byte[] b = File.ReadAllBytes(path);

            var b1 = b.Distinct();

            foreach (byte a in b1)

            {

                Console.WriteLine("Частота появления числа " + a + " равна " + ((float)b.Count(l => l == a) / (float)b.Length));

                f += -((float)b.Count(l => l == a) / (float)b.Length) * Math.Log((float)b.Count(l => l == a) / (float)b.Length) / Math.Log(2);

            }

            Console.WriteLine("Энтропия равна " + f);

            Console.ReadKey();

        }

    }

}
/*using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;


namespace Structure
{
    class Student
    {
        string sname, name;
        int date, mark;

        public Student(string a, string b, int c, int d)
        {
            sname = a;
            name = b;
            date = c;
            mark = d;
        }

        public string show()
        {
            return String.Format("Student:\n\tName: {0}\n\tSurname: {1}\n\tDate of birth: {2}\n\tAverage mark: {3}", name, sname, date, mark);
        }
    }


    class Program
    {
        public static void Main(string[] args)
        {

            //File.WriteAllText("F:\\input.txt", "surush surush 1 2");


           // string s;
            /* StreamReader reader = new StreamReader( "F:\\input.txt" );
            StreamWriter writer = new StreamWriter("F:\\Grouop.bin");
            while (true)
            {
                s = Console.ReadLine();
                if (s[0] == ' ')
                    break;
                s = s + "\r\n";
                Console.WriteLine(s);
                writer.WriteLine(s);
            }
            writer.Close();

string[] lines = File.ReadAllLines("F:\\Grouop2.bin");
            StreamWriter writer = new StreamWriter("F:\\output.txt");
            for (int i = 0; i < lines.Length; i++)
             {
                 Console.WriteLine(lines[i]);
                writer.WriteLine(lines[i]);
             }
            writer.Close();
            Console.Write("Press any key to continue . . . ");
            Console.ReadKey(true);
        }
    }
}*/