public static void Main()
Console.WriteLine("Where is imported: \n 1. National \n 2. America \n 3. Asia \n 4. Europe : ");
i = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Type the cost: ");
int c = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("The cost is :{0} ", tt);
Console.Write("{0} ", n);