题解 | #获得月份天数#

while True:
    try:
        y,m = map(int,input().split())
        if m in (1,3,5,7,8,10,12):
            print(31)
        if m in (4,6,9,11):
            print(30)
        if m == 2:
            if y%100 == 0:
                if y%400 == 0:
                    print(29)
            else:
                if y%4 ==0:
                    print(29)
                else:
                    print(28)
    except:
        break