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#!/usr/bin/env python3
import sys
from datetime import date, timedelta
def main(year, month, week, dofw):
# Get the first of the month
dte = date(year, month, 1)
# Day of the week for the first of the month (1 - Monday, 7 - Sunday)
first_weekday = dte.isoweekday()
# To get the first day of week we take the diff between the two values. If
# it is negative, add 7 days
add_days = dofw - first_weekday
if add_days < 0:
add_days += 7
# Now add the weeks
add_days += (week-1) * 7
new_date = dte + timedelta(days=add_days)
if new_date.month != dte.month or new_date.year != dte.year:
# This date does not exist
print(0)
else:
# Print the day of month
print(new_date.day)
if __name__ == '__main__':
# Convert input into integers
array = [int(n) for n in sys.argv[1:]]
main(*array)
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