04. Metric Converter - Solution 2

using System;

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

            double result = 0;

            if(input == "m")
            {
                if (output == "cm")
                {
                    result = num * 100;
                }
                else if (output == "mm")
                {
                    result = num * 1000;
                }
            }
            else if(input == "cm")
            {
                if (output == "m")
                {
                    result = num / 100;
                }
                else if (output == "mm")
                {
                    result = num * 10;
                }
            }
            else if(input == "mm")
            {
                if (output == "cm")
                {
                    result = num / 10;
                }
                else if (output == "m")
                {
                    result = num / 1000;
                }
            }


            Console.WriteLine($"{result:f3}");
        }
    }
}