using System;

public class Program

{

    public static void Main()

    {

        Console.Write("Please, enter side A: ");

        var a = decimal.Parse(Console.ReadLine());

        Console.Write("Please, enter sie B: ");

        var b = decimal.Parse(Console.ReadLine());

        Console.Write("The Ractangle's fase is: " +  a*b);

    }

}