using System;

namespace Problem_4._Tourist_Information
{
    class Program
    {
        static void Main(string[] args)
        {
            string imperialUnite = Console.ReadLine();
           float value = float.Parse(Console.ReadLine());
            float kilometers = 0;
            switch (imperialUnite)
            {
                case "miles":
                     kilometers=(float)(value * 1,50);
                    break;
            }
        }
    }
}