n = int(input())
ls_1 = [2, 3, 5, 7, 11, 13]
ls_2 = [4, 6, 8, 9, 10, 12]

res = [(e_1, e_2) for e_1 in ls_1 for e_2 in ls_2 if e_1 * e_2 == n]
print(len(res) / 36)