import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

K = int(read())

prod = [x * y for x in [2,3,5,7,11,13] for y in [4,6,8,9,10,12]]

answer = sum(x == K for x in prod) / 36
print(answer)