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days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
day = 7 # first sunday in 1900
count = 0
for year in range(1900, 2001):
for month in range(1, 13):
if day == 1 and year >= 1901:
count += 1
if month == 2 and year % 4 == 0:
day -= 1
while(day <= days[month-1]):
day += 7
day -= days[month-1]
print count
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