# coding=utf-8:

k = int(input())
d1 = [2, 3, 5, 7, 11, 13]
d2 = [4, 6, 8, 9, 10, 12]

a1 = [k / i for i in d1]

c = 0

for i in range(len(d1)):
    if d2[i] in a1:
        c += 1

ans = c / 36
if ans == 0:
    print(int(ans))
elif 36 % ans == 0:
    print(int(ans))
else:
    print(round(ans, 20))