K = int(input())
P = [2, 3, 5, 7, 11, 13]
Q = [4, 6, 8, 9, 10, 12]
cnt = 0
for i in range(6):
    for j in range(6):
        if P[i] * Q[j] == K:
            cnt += 1
print(cnt / 36)