using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        double numberToConvert = double.Parse(Console.ReadLine());

        string firstUnit = Console.ReadLine();
        string secondUnit = Console.ReadLine();

        var units = new Dictionary<string, double>()
                              {
            { "m", 1d },
            { "mm", 1000d },
            { "cm", 100d },
            { "mi", 0.000621371192d },
            { "in", 39.3700787d },
            { "km", 0.001d },
            { "ft", 3.2808399d },
            { "yd", 1.0936133d}
                                };
        double result = numberToConvert / units[firstUnit] * units[secondUnit];
        Console.WriteLine(Math.Round(result, 8));
    }
}