using System;

namespace Data_Types
{
    class Program
    {
        static void Main(string[] args)
        {
            string type = Console.ReadLine();

            switch (type)
            {
                case "int":
                    int inputInt = int.Parse(Console.ReadLine());
                    GetResult(inputInt);
                    break;
                case "real":
                    double inputDouble = double.Parse(Console.ReadLine());
                    GetResult(inputDouble);
                    break;
                case "string":
                    string inputString = Console.ReadLine();
                    GetResult(inputString);
                    break;
            }
        }

        private static void GetResult(string inputString)
        {
            Console.WriteLine($"${inputString}$");
        }

        private static void GetResult(double inputDouble)
        {
            Console.WriteLine($"{(inputDouble * 1.5):f2}");
        }

        private static void GetResult(int inputInt)
        {
            Console.WriteLine(inputInt * 2);
        }

    }
}