from collections import Counter

L1 = [2, 3, 5, 7, 11, 13]
L2 = [4, 6, 8, 9, 10, 12]
L3 = [i*j for i in L1 for j in L2]
L = Counter(L3)

K = int(input())
X = [0, L[K]][K in L]

print(X / 36)