metricConverter

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

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

            var metrics = new Dictionary<string, double>()
            {
                {"m", 1},
                {"mm", 1000},
                {"cm", 100},
                {"mi", 0.000621371192},
                {"in", 39.3700787},
                {"km", 0.001},
                {"ft", 3.2808399},
                {"yd", 1.0936133},
            };

            var result = distance * (metrics[metricOutput] / metrics[metricInput]);

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