month = (0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)


def testyear(x):
  if x % 400 == 0:
    return True
  if x % 100 != 0 and x % 4 == 0:
    return True
  return False


pair = [[1900, 1], 1]

def next():
  pair[1] += month[pair[0][1]]
  if testyear(pair[0][0]) and pair[0][1] == 2:
    pair[1] += 1
  pair[1] %= 7
  pair[0][1] += 1
  if pair[0][1] > 12:
    pair[0][1] = 1
    pair[0][0] += 1

total = 0
for i in xrange(12):
  next()

while pair[0][0] < 2001:
  if pair[1] == 0:
    total += 1
  next()

print total