# Solutions
# zellers.py
# Jan 3, 2011

month = input('Month (1-12)? ')
day = input('Day (1-31)? ')
year = input ('Year (4 digits)? ')

# Assume all valid inputs (ie numbers)
A = (month - 2) % 12
B = day
C = (year % 100)
if A > 10:
  C = C - 1  # Decrement C for months Jan and Feb.
D = year/100  # Integer division to keep the first 2 digits.

W = (13*A - 1) / 5 
X = C / 4 
Y = D / 4 
Z = W + X + Y + B + C - 2*D 
R = Z % 7
print # prints a blank line
print month, "-", day, "-", year, "was a:", R
print "(0 means Sunday, 1 means Monday, ..., 6 means Saturday)"