import datetime
import time
import calendar

def cal(year, month):
        first_day = 1 # monday = firstday
        first_of_month = datetime.date(year, month, 1)

        day_names = []
        n = 0
        t = (3 + first_day) * 86400

        while n < 7:
                day_names.append(time.strftime('%A', time.gmtime(t)))
                n += 1
                t += 86400

        arr = first_of_month.strftime('%m,%Y,%B,%w').split(',')
        weekday = (int(arr[3]) + 7 - first_day) % 7

        if calendar.isleap(year):
                feb = 29
        else:
                feb = 28
        days_in_month = [31, feb, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
        day = 1
        dim = days_in_month[month - 1]

        d = []
        tmp = []
        if weekday > 0:
                for i in range(weekday):
                        tmp.append(0)
        while day <= dim:
                if weekday == 7:
                        weekday = 0
                        d.append(tmp)
                        tmp = []
                tmp.append(day)

                day += 1
                weekday += 1
        d.append(tmp)
        print d