import argparse
from calendar import monthrange
from datetime import date, datetime

a = 0.092
b = -2.9124

def get_x(year, month=None, day=None):
    assert(2009 <= year)
    if month is None:
        assert(day is None)
        month = 6.5

    numof_months = (year - 2009) * 12 + month

    if day is None:
        return numof_months

    numof_days = monthrange(year, month)[1]
    return numof_months + (day - 0.5) / numof_days - 0.5

def price(dt):
    x = get_x(*dt)
    return 10 ** (a * x + b)

def date_tuple(str):
    month, day = None, None
    try:
        dt = datetime.strptime(str, '%Y-%m-%d')
        year, month, day = dt.year, dt.month, dt.day
    except ValueError:
        try:
            dt = datetime.strptime(str, '%Y-%m')
            year, month = dt.year, dt.month
        except ValueError:
            dt = datetime.strptime(str, '%Y')
            year = dt.year
    return year, month, day

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('date', type=date_tuple, nargs='?',
                        help='YYYY-MM-DD or YYYY-MM or YYYY')
    args = parser.parse_args()
    if args.date is None:
        dt = date.today()
        args.date = (dt.year, dt.month, dt.day)
    print '{0:.2f}'.format(price(args.date))

if __name__ == '__main__':
    main()