using System;

namespace MetricConverter
{
    class Program
    {
        static void Main(string[] args)
        {
            double distance = double.Parse(Console.ReadLine());

            string metric = Console.ReadLine();
            string toMetric = Console.ReadLine();

            double fromInMeters = 0;

            if (metric == "m")
            {
                fromInMeters = distance;
            }
            else if (metric == "mm")
            {
                fromInMeters = distance / 1000;
            }
            else if (metric == "cm")
            {
                fromInMeters = distance / 100;
            }
            else if (metric == "mi")
            {
                fromInMeters = distance / 0.000621371192;
            }
            else if (metric == "in")
            {
                fromInMeters = distance / 39.3700787;
            }
            else if (metric == "km")
            {
                fromInMeters = distance / 0.001;
            }
            else if (metric == "ft")
            {
                fromInMeters = distance / 3.2808399;
            }
            else if (metric == "yd")
            {
                fromInMeters = distance / 1.0936133;
            }

            double result = 0;

            if (toMetric == "m")
            {
                result = distance;
            }
            else if (toMetric == "mm")
            {
                result = fromInMeters * 1000;
            }
            else if (toMetric == "cm")
            {
                result = fromInMeters * 100;
            }
            else if (toMetric == "mi")
            {
                result = fromInMeters * 0.000621371192;
            }
            else if (toMetric == "in")
            {
                result = fromInMeters * 39.3700787;
            }
            else if (toMetric == "km")
            {
                result = fromInMeters * 0.001;
            }
            else if (toMetric == "ft")
            {
                result = fromInMeters * 3.2808399;
            }
            else if (toMetric == "yd")
            {
                result = fromInMeters * 1.0936133;
            }

            Console.WriteLine($"{result:F8}");
        }
    }
}