using System;
using System.Collections.Generic;

namespace MetricConverter
{
    class Program
    {
        static void Main(string[] args)
        {
            double fromMetric = double.Parse(Console.ReadLine());
            string from = Console.ReadLine();
            string to = Console.ReadLine();
            var currecies = new Dictionary<string, double>()
            {
                {"m", 1.0 },
                {"mm", 1000.0 },
                {"cm", 100 },
                {"mi", 0.000621371192},
                {"in", 39.3700787},
                {"km", 0.001},
                {"ft", 3.2808399},
                {"yd", 1.0936133}
            };
            double result = fromMetric / currecies[from] * currecies[to];
            Console.WriteLine($"{result:F8}");
        }
    }
}