public class Date {
	private int month;
	private int day;
	private int year;
	public Date(int ismonth, int isday, int isyear) {
		month=ismonth;
		day=isday;
		year=isyear;
	}
	public Date() {
		month=1;
		day=1;
		year=1900;
	}
	public void printDate() {
		System.out.println(month + "/" + day + "/" + year);
	}
	public void advance() {
		boolean leapYear = (year % 4 == 0 && year % 100 != 0) || year % 400 == 0;
		day += 1;
		while ((month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12 && day > 31) || (month == 2 && (day > 29 && leapYear || day > 28 && !leapYear))||(month == 4 || month == 6 || month == 9 || month == 11 && day > 30)) {
			if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
				if (day>31) {
					day = 1;
					month += 1;
				}
			}
			else if (month == 2) {
				if (leapYear && day>29) {
					day = 1;
					month+=1;
				}
				else if (day>28 && !leapYear){
					day = 1;
					month+=1;
				}
			}
			else {
				if (day>30) {
					day = 1;
					month+=1;
				}
				if (month>12) {
					while (month>12) {
						month = month - 12;
						year += 1;
					}
				}
			}
		}
	}
	public void advance(int adv) {
		boolean leapYear = (year % 4 == 0 && year % 100 != 0) || year % 400 == 0;
		day += adv;
		while ((month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12 && day > 31) || (month == 2 && (day > 29 && leapYear || day > 28 && !leapYear))||(month == 4 || month == 6 || month == 9 || month == 11 && day > 30)) {
			if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
				if (day>31) {
					day = day-31;
					month += 1;
				}
			}
			else if (month == 2) {
				if (leapYear && day>29) {
					day = day-29;
					month+=1;
				}
				else if(day>28 && !leapYear) {
					day = day-28;
					month+=1;
				}
			}
			else {
				if (day>30) {
					day = day-30;
					month+=1;
				}
				if (month>12) {
					while (month>12) {
						month = month - 12;
						year += 1;
					}
				}
			}
		}
	}
	public boolean equals(Date d) {
		return d.toString().equals("("+ month + "/" + day + "/" + year + ")");
	}
	public int year() {
		return year;
	}
	public int day() {
		return year;
	}
	public int month() {
		return year;
	}
	public boolean isBefore(Date e) {
		//x.isBefore(y) true if x is before y
		if ((month < e.month() && year == e.year()) || (day < e.day() && month < e.month() && year == e.year()) || (year < e.year())) {
			return true;
		}
		return false;
	}
	public int daysUntil(Date x) {
		Date d1 = new Date(month, day, year);
		Date d2 = new Date(x.month(), x.day(), x.year());
		int counter = 0;
		if ((month < x.month() && year == x.year()) || (day < x.day() && month < x.month() && year == x.year()) || (year < x.year())) {
			while (!(month == d1.month() && day == d1.day() && year == d1.year)) {
			d1.advance();
			counter++;
			}
		} else if (month == x.month() && day == x.day() && year == x.year) {
			return 0;
		} else {
			while (!(month == d2.month() && day == d2.day() && year == d2.year)) {
				d2.advance();
				counter++;
			}
		}
		return counter;
	}
	public String toString() {
		return  "("+ month + "/" + day + "/" + year + ")";
	}
}