class SimpleDate(private var d:Int,private var m:Int) {
  checkInputAndFix()

  private var dayInYear  = (d-1 + ((m-1)*30))

  def day:Int = dayInYear%30 + 1
  def day_=(x:Int){
    if(0<x && x<31){
    dayInYear = (dayInYear%30+x)%360 + 1
    }else{
      throw new wrongDate("Wrong day!")
    }
  }
  def month:Int = dayInYear/30 + 1
  def month_=(x:Int){
    if(0<x && x<13){
    dayInYear = (dayInYear%30+x*30)%360
    }else{
      throw new wrongDate("Wrong month!")
    }
  }

  def przesun(liczbaDni:Int){
    dayInYear = (dayInYear + liczbaDni) % 360
  }

  private def checkInputAndFix(){
    if(d<1){
    d = 1
    }
    if(d>30){
      d=30
    }
    if(m<1){
      m=1
    }
    if(m>12){
      m=12
    }
  }
}

object SimpleDate {
def apply(d: Int, m: Int) = new SimpleDate(d,m)
}
class wrongDate(message:String) extends Exception{
  print(message)
}


var date = new SimpleData(15,11)
date.day

var date2 = new SimpleData(29,12)