using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Podaj pierwszą liczbę");

        string a1 = Console.ReadLine();

        double a = Double.Parse(a1.Replace(',', '.'), NumberStyles.Number, CultureInfo.InvariantCulture);

        Console.WriteLine("Podaj drugą liczbę");

        string a2 = Console.ReadLine();

        double b = Double.Parse(a2.Replace(',', '.'), NumberStyles.Number, CultureInfo.InvariantCulture);

        double suma = a+b;

        double roznica = a-b;

        double iloczyn = a*b;

        double iloraz = a/b;

        Console.WriteLine("Suma: " +suma + "\n" + "Różnica: " +roznica + "\n" + "Iloczyn: " +iloczyn + "\n" + "Iloraz: " +iloraz);

        Console.ReadLine();

    }

}