def main():
    K = int(input())

    a = {2, 3, 5, 7, 11, 13}
    b = {4, 6, 8, 9, 10, 12}
    product = [0] * 36
    i = 0
    for j in a:
        for k in b:
            product[i] = j * k
            i += 1

    cnt = product.count(K)
    print(cnt / 36)

main()