#include <stdio.h>
 
int is_uruu(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;
}
 
int maxday_of_month(int y, int m)
{
    if(m == 1 || m == 3 || m == 5 || m == 7 || m == 8 || m == 10 || m == 12)
    {
        return 31;
    }
    else if(m == 4 || m == 6 || m == 9 || m == 11)
    {
        return 30;
    }
    else if(m == 2)
    {
        if(is_uruu(y))
            return 29;
        else
            return 28;
    }
    else
    {
        return 0;
    }
}
 
int main()
{
    int y, m;
 
    scanf("%d %d", &y, &m);
 
    printf("%d\n", maxday_of_month(y, m));
 
    return 0;
}

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