metric conversion

import java.util.Scanner;

public class MetricConverter_04 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        double conversionNum = Double.parseDouble(scanner.nextLine());
        String entrance = scanner.nextLine();
        String exit = scanner.nextLine();

        double mCm = conversionNum * 100;
        double mMm = conversionNum * 1000;

        double cmM = conversionNum * 0.01;
        double cmMm = conversionNum * 10;

        double mmM = conversionNum * 0.001;
        double mmCm = conversionNum * 0.1;

        if (entrance.equals("m") && exit.equals("cm")) {
           System.out.printf("%.03f", mCm);
        } else if (entrance.equals("m") && exit.equals("mm")) {
            System.out.printf("%.03f", mMm);
        } else if (entrance.equals("cm") && exit.equals("mm")) {
            System.out.printf("%.03f", cmMm);
        } else if (entrance.equals("cm") && exit.equals("m")) {
            System.out.printf("%.03f", cmM);
        } else if (entrance.equals("mm") && exit.equals("m")) {
            System.out.printf("%.03f", mmM);
        } else if (entrance.equals("mm") && exit.equals("cm")) {
            System.out.printf("%.03f", mmCm);
        }
    }
}