using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        decimal[] values = {-1.7m , 3.0m , 0.0m , 1.5m , 0.0m , -1.7m , 2.3m , -1,7m};

        var result = values

            .GroupBy(v => v)

            .ToDictionary(g => g.Key, g => g.Count());

        foreach(var kvp in result)

        {

            Console.WriteLine("{0} appears {1} time(s)", kvp.Key, kvp.Value);

        }

    }

}