class Box implements Weighable {

  private int length;
  private int width;
  private int height;
  private double massInKgs;

  private static final double KG_PER_LB = 2.2;
  

  public Box (int length, int width, int height, double massInKgs) {
  
    this.length = length;
    this.width = width;
    this.height = height;
  
    this.massInKgs = massInKgs;
  }
  
  
  public void addToBox (int massInKgs) {
  
    this.massInKgs += massInKgs;
  
  }
  
  
  public String toString() {
    return "" + width + " x " + length + " x " + height + " " + 
           massInKgs + " kgs";
  }
  
  
  public boolean equals (Object o) {
  
    Box b = (Box) o;
    
    if (this.width != b.width) return false;
    if (this.height != b.height) return false;
    if (this.length != b.length) return false;
    if (this.massInKgs != b.massInKgs) return false;
    
    return true;
  }
  
  
  public double getMassInKgs() {
  
    return massInKgs;
  }
  
  public double getWeightInLbs() {
    return KG_PER_LB * massInKgs;
  }
  
  

}