import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
sys.setrecursionlimit(10 ** 7)

k = int(readline())
cnt = 0
prime_list = [2, 3, 5, 7, 11, 13]
check_list = [4, 6, 8, 9, 10, 12]
for prime in prime_list:
    for check in check_list:
        if k == prime * check:
            cnt += 1
print(cnt / 36)