package com.company;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);

        Double a = Double.parseDouble(scanner.nextLine());
        Double b=a;
        String x = scanner.nextLine();
        String y = scanner.nextLine();
        Double mm =1000.0;
        Double cm = 100.0;
        Double mi = 0.000621371192;
        Double in = 39.3700787;
        Double km = 0.001;
        Double ft = 3.2808399;
        Double yd = 1.0936133;
        Double m  = 1.0;

        if (x.equals("mm")) {
            b = a / mm;
        } else if (x.equals("cm")) {
            b = a / cm;
        } else if (x.equals("mi")) {
            b = a / mi ;

        }else if (x.equals("in")) {
            b = a / in  ;
        }else if (x.equals("km")) {
            b = a / km  ;
        }else if (x.equals("ft")) {
            b = a / ft   ;
        }else if (x.equals("yd")) {
            b = a / yd    ;
        } else if (x.equals("m")) {
            b = a/m;
        }

        if (y.equals("mm")) {
            b = b * mm;
        } else if (y.equals("cm")) {
            b = b * cm;
        } else if (y.equals("mi")) {
            b = b * mi ;
        }else if (y.equals("in")) {
            b = b * in  ;
        }else if (y.equals("km")) {
            b = b * km  ;
        }else if (y.equals("ft")) {
            b = b * ft   ;
        }else if (y.equals("yd")) {
            b = b * yd    ;
        } else if (y.equals("m")) {
            b = b*m;
        }

        System.out.printf("%.8f",b);


    }
}