Metric Converter

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double number = Double.parseDouble(scanner.nextLine());
        String inputMetric = scanner.nextLine(),
                outputMetric = scanner.nextLine();

        if (inputMetric.equals("mm")) {
            if (outputMetric.equals("cm")) {
                number /= 10;
            } else {
                number /= 1000;
            }
        } else if (inputMetric.equals("cm")) {
            if (outputMetric.equals("m")) {
                number /= 100;
            } else {
                number *= 10;
            }
        } else {
            if (outputMetric.equals("cm")) {
                number *= 100;
            } else {
                number *= 1000;
            }
        }

        System.out.printf("%.3f", number);
    }
}