k = gets.chomp.to_i

primes = [2, 3, 5, 7, 11, 13]
count = 0
primes.each {|prime|
    if k % prime == 0 and [4, 6, 8, 9, 10, 12].include?(k / prime)
        count += 1
    end
}

puts count.to_f / 36