题解 | #获得月份天数#

while True:
    try:
        y,m=map(int,input().split())
        if y%4==0 and y%100!=0 or y%400==0:
            if m in [1,3,5,7,8,10,12]:
                print(31)
            elif m in [4,6,9,11]:
                print(30)
            else:
                print(29)
        else:
            if m in [1,3,5,7,8,10,12]:
                print(31)
            elif m in [4,6,9,11]:
                print(30)
            else:
                print(28)
    except:
        break