using System;

public class Program

{

    public static void Main(string[] args)

    {

        string [] s = Console.ReadLine().Split(' ');

        int m = int.Parse(s[0]);

        int y = int.Parse(s [1]);

        int v = (( y % 4 == 0 && y % 100 !=0) || y % 400 == 0) ? 29 : 28;

        switch (m)

        { 

            case 1:

            case 3:

            case 5:

            case 7:

            case 8:

            case 10:

            case 12:

                v= 31;

                break;

            case 4:

            case 6:

            case 9:

            case 11:

                v = 30;

                break;

        }

        Console.WriteLine(v);

    }}

​