from collections import defaultdict

k = int(input())
lst = [2, 3, 5, 7, 11, 13]
lst2 = [4, 6, 8, 9, 10, 12]
dd = defaultdict(int)
for num in lst:
    for num2 in lst2:
        dd[num * num2] += 1
print(dd[k] / 36)