import java.util.*;

public class Months {

	public static void main(String[] args) {

		Scanner input = new Scanner(System.in);

		System.out.print("Month (1-12): ");
		int month = input.nextInt();


		if (1 <= month && month <= 12) {
			System.out.print("Year: ");
			int year = input.nextInt();

				int days = numDays(month, year);

				System.out.println("Number of days in month " + month + " is "
						+ days);
			} else {
				System.out.println(month + " is not a valid month number");
			}
	}

	// ------------------------------
	public static int numDays(int month, int yr) {
		int days;
		if (month == 2) {
			
//			days = 28 + isLeapYear1(yr);
			
			days = 28;
			if (isLeapYear2(yr)) {
				days++;
			}
			
		} else if (month == 4) {
			days = 30;
		} else if (month == 6) {
			days = 30;
		} else if (month == 9) {
			days = 30;
		} else if (month == 11) {
			days = 30;
		} else {
			days = 31;
		}

		return days;
	}
	
	//---------------------------------------
	public static int isLeapYear1(int year) {
		if (year % 400 == 0) {
			return 1;
		} else if (year % 100 == 0) {
			return 0;
		} else if (year % 4 == 0) {
			return 1;
		} else {
			return 0;
		}
	}
	
	//---------------------------------------
	public static boolean isLeapYear2(int year) {
		if (year % 400 == 0) {
			return true;
		} else if (year % 100 == 0) {
			return false;
		} else if (year % 4 == 0) {
			return true;
		} else {
			return false;
		}
	}
	
	//--------------------------------------
	public static boolean isLeapYear3(int yr) {
		return ((yr % 400 == 0) || (!(yr % 100 == 0) && (yr % 4 == 0)));
	}

}