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);
}