#!/usr/bin/env python
# -*- coding: utf-8 -*-

pS = [2,3,5,7,11,13]
cS = [4,6,8,9,10,12]

K = int(input())
ans=0
for p in pS:
    for c in cS:
        if p*c == K:
            ans += 1
print(ans/36)