Inches

import java.util.Scanner;
public class Scan {
    public static void main (String[] args)
    {
        Scanner in = new Scanner(System.in);

        System.out.println("Podaj szerokość w calach");
        Double paperWidth = in.nextDouble();

        System.out.println("Podaj wysokość w calach");
        Double paperHeight = in.nextDouble();


        final double CM_PER_INCH = 2.54;
        double width = paperWidth * CM_PER_INCH;
        double height = paperHeight * CM_PER_INCH;

        System.out.println("Rozmiar kartki wynosi "+width+"cm na "+height+"cm");
    }

}