import datetime
now = datetime.datetime.now()
while 1:
    year = now.year
    month = now.month
    dob = raw_input("Year: ")
    month1 = raw_input("Month: ")

    dob = int(dob)
    year = int(year)
    month1 = int(month1)

    estyear = (year - dob)
    print estyear