using System;
public class Program
{
public static void Main()
Console.WriteLine("Hello World");
{double num1,sum;
int num2;
Console.WriteLine("wbook price");
num1=double.Parse(Console.ReadLine());
Console.WriteLine("wbook number");
num2=int.Parse(Console.ReadLine());
sum=num1*num2;
Console.WriteLine("the sum is {0}",sum); }