interface Comparable {
  public int compareTo(Object that);
}

class Byte implements Comparable {
  private byte value;
  public Byte(byte value){ this.value = value; }
  public byte byteValue(){ return value; }
  public int compareTo(Byte that){
    return this.value - that.value;
  }
  public int compareTo(Object that){
    return this.compareTo((Byte) that);
  }
}

class Collections {
  public static Comparable max(Collection xs){
    Iterator xi = xs.iterator();
    Comparable w = (Comparable) xi.next();
    while(xi.hasNext()){
      Comparable x = (Comparable) xi.next();
      if(w.compareTo(x) < 0) w = x;
    }
    return w;
  }
}