N = int(input()) - 2014
C, ANS = 0, (N // 400) * 57
N %= 400
for i in range(15, 15 + N):
	C += (1 + (i % 400 == 0 or (i % 100 != 0 and i % 4 == 0)))
	ANS += (C % 7 == 0)
print(ANS)