import java.util.*;
public class Main {
	public static void main(String[] args) {
			Scanner s=new Scanner(System.in);
			int year = s.nextInt();
			int month = s.nextInt();
			switch(month) {
			case 1,3,5,7,8,10,12:
				System.out.println(31);
			break;
			case 4,6,9,11:
				System.out.println(30);
			break;
			case 2: 
				if((year%4==0&&year%100!=0)||(year%400==0)) {
				System.out.println(29);}
			else {
				System.out.println(28);}
				break;
			default :System.out.println("请输入正确的月份");
			break;
			}
	    
}
}```