import java.util.Scanner;

public class MetricConverter {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double numberToConvert = Double.parseDouble(scanner.nextLine());
        String unit = scanner.nextLine();
        String resultUnit = scanner.nextLine();
        double result = 0.0;
        if (unit.equals("m") && resultUnit.equals("cm")) {
            result = numberToConvert*100;
        } else if (unit.equals("m") && resultUnit.equals("mm")) {
            result = numberToConvert * 1000;
        }  else if (unit.equals("cm") && resultUnit.equals("mm")) {
        result = numberToConvert*10;
        }  else if (unit.equals("cm") && resultUnit.equals("m")) {
            result = numberToConvert*0.01;
        }  else if (unit.equals("mm") && resultUnit.equals("cm")) {
            result = numberToConvert*0.1;
        }  else if (unit.equals("mm") && resultUnit.equals("m")) {
            result = numberToConvert * 0.001;
        }
        System.out.printf("%.3f", result);
    }
}