def main():
    K = int(input())
    primes = (2, 3, 5, 7, 11, 13)
    non_primes = (4, 6, 8, 9, 10, 12)

    ctr = 0
    for prime in primes:
        for non_prime in non_primes:
            if prime * non_prime == K:
                ctr += 1

    print(ctr / 36)


if __name__ == "__main__":
    main()