using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter number");

        int x=int.Parse(Console.ReadLine());

        Console.WriteLine("Enter input value");

        string invalue=Console.ReadLine();

        Console.WriteLine("Enter output value");

        string outvalue=Console.ReadLine();

        double y=0;

        if (invalue=="mm")

            y=x/1000;

        if (invalue=="cm")

            y=x/100;

        if (invalue=="mi")

            y=x/0.000621371192;

        if (invalue=="in")

            y=x/39.3700787;

        if (invalue=="km")

            y=x/0.001;

        if (invalue=="ft")

            y=x/3.2808399;

        if (invalue=="yd")

            y=x/1.0936133;

        if (outvalue=="mm")

        Console.WriteLine(y*1000);

        if (outvalue=="cm")

        Console.WriteLine(y*100);

        if (outvalue=="mi")

        Console.WriteLine(y*0.000621371192);

        if (outvalue=="in")

        Console.WriteLine(y*39.3700787);

        if (outvalue=="km")

        Console.WriteLine(y*0.001);

        if (outvalue=="ft")

        Console.WriteLine(y*3.2808399);

        if (outvalue=="yd")

        Console.WriteLine(y*1.0936133);

    }

}