using System;

public class Program

{

    public static void Main()

    {

        Double pricebook;

        int hmbook;

        double sum ;

Console.WriteLine("ادخل سعر الكتاب");

pricebook=double.Parse(Console.ReadLine());

Console.WriteLine("ادخل عدد الكتب");

hmbook=int.Parse(Console.ReadLine());

sum=pricebook*hmbook;

Console.WriteLine("the sum is {0}",sum);

    }

    }