// Compute the number of days in a user-specified month 	
	
import java.util.*;	
	
public class DaysInMonth {	
	// main(): application entry point 	
	public static void main(String[] args) {	
		final int JANUARY = 1;      final int JULY = 7;	
		final int FEBRUARY = 2;     final int AUGUST = 8;	
		final int MARCH = 3;        final int SEPTEMBER = 9;	
		final int APRIL = 4;        final int OCTOBER = 10;	
		final int MAY = 5;          final int NOVEMBER = 11;	
		final int JUNE = 6;         final int DECEMBER = 12;	
	
		final int CALENDAR_START = 1582;	
	
		// get an input reader 	
		Scanner stdin = new Scanner(System.in);	
	
		// get date information of interest 	
		System.out.println("");	
		System.out.print("Enter year: ");	
		int year = stdin.nextInt();	
		System.out.print("Enter month: ");	
		int month = stdin.nextInt();	
	
		// validate input 	
		if ((year < CALENDAR_START) || (month < 1) || (month > 12)) {	
			System.out.println("Bad request: " + year + " " 	
					+ month);	
			System.exit(1);	
		}	
	
		// determine whether year is a leap year 	
		boolean isDivisibleBy4 = (year % 4) == 0;	
		boolean isDivisibleBy100 = (year % 100) == 0;	
		boolean isDivisibleBy400 = (year % 400) == 0;	
	
		boolean isLeapYear = isDivisibleBy4	
			&& ((! isDivisibleBy100) || isDivisibleBy400);	
	
	// use month and year information to determine number of days 	
	int days;	
	switch (month) {	
		case JANUARY: case MARCH: case MAY: case JULY: case AUGUST: 	
		case OCTOBER: case DECEMBER:	
			days = 31;	
			break;	
		case APRIL: case JUNE: case SEPTEMBER: case NOVEMBER:	
			days = 30;	
			break;	
		case FEBRUARY: 	
			days = isLeapYear ? 29 : 28;	
			break;	
		default:	
			days = 0;	
	}	
	
	System.out.println("");	
	System.out.println("Month " + month + " in year " + year	
									+ " has " + days + " days");	
	}	
}