package com.company;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        double size = Double.parseDouble(scanner.nextLine());


        double m = 1;
        double cm = 100;
        double mm = 1000;
        double mi = 0.000621371192;
        double in = 39.3700787;
        double km = 0.001;
        double ft = 3.2808399;
        double yd = 1.0936133;

        String sourceMetric = scanner.nextLine();
        String destMetric = scanner.nextLine();

        if(sourceMetric.equals ("mm"))
            size = size / 1000;
        else if (sourceMetric.equals ("cm"))
            size = size / 100;
        else if (sourceMetric.equals ("mi"))
            size = size / 0.000621371192;
        else  if(sourceMetric.equals ("in"))
            size = size / 39.3700787;
        else if(sourceMetric.equals ("km"))
            size = size / 0.001;
        else if(sourceMetric.equals("ft"))
            size = size / 3.2808399;
        else if (sourceMetric.equals ("yd"))
            size = size / 1.0936133;

        if(destMetric.equals ("mm"))
            size = size * 1000;
        if(destMetric.equals ("cm"))
            size = size * 100;
        if(destMetric.equals ("mi"))
            size = size * 0.000621371192;
        if(destMetric.equals ("in"))
            size = size * 39.3700787;
        if(destMetric.equals ("km"))
            size = size * 0.001;
        if(destMetric.equals ("ft"))
            size = size * 3.2808399;
        if(destMetric.equals ("yd"))
            size = size * 1.0936133;

        System.out.printf("%.7f",size);
    }
}