//zad.2b
class Time(private var godz:Int,private var minute:Int)
{
    require(godz>=0 && godz<=23 && minute>=0 && minute<60)
    def mm:Int=godz*60+minute;
  def mm_=(y:Int,x:Int)
  {
        require(y>=0 && y<=23 && x>=0 && x<60)
        minute=x;
        godz=y;
  }
  def before(other:Time):Boolean=
      this.godz*60+this.minute<other.godz*60+other.minute
}