n = int(input())
n_list = range(1, n+1)
z = []

for i in n_list:
    if i % 15 == 0:
        z.append("zzzz")
    elif i % 3 == 0:
        z.append("zz")
    elif i % 5 == 0:
        z.append("zz")

fizzbuzz = "".join(z)
ans = fizzbuzz.count("z")
print(ans)