// Declara aqui la classe (sense cap modificador)

public class Main {
    public static void main(String[] args) {
        Box box = new Box();

        box.length = 10000.5f;
        box.height = 3000.5f;
        box.width = 4000.75f;

        box.innerBox = new Box();

        box.innerBox.length = 1000.5f;
        box.innerBox.height = 300.5f;
        box.innerBox.width = 400.75f;

        box.innerBox.innerBox = new Box();

        box.innerBox.innerBox.length = 100.5f;
        box.innerBox.innerBox.height = 30.5f;
        box.innerBox.innerBox.width = 40.75f;

        box.innerBox.innerBox.innerBox = new Box();

        box.innerBox.innerBox.innerBox.length = 10.5f;
        box.innerBox.innerBox.innerBox.height = 3.5f;
        box.innerBox.innerBox.innerBox.width = 4.75f;

        System.out.println(box.innerBox.innerBox.innerBox.width);
    }
}