题解 | #获得月份天数#

while 1:

    try:
        year,month = map(int,input().split())

        if month == 2:
            
            if (year % 4 == 0) and (year % 100 != 0) or (year % 400 == 0):
                day = 29
            else:
                day = 28

        else:

            if month in (4,6,9,11):
                day = 30
            else:
                day = 31
        
        print(day)

    except:
        break