N = int(input())
# L = []
l = ""
for i in range(1, N + 1):
    if i % 15 == 0:
        # L.appned("FizzBuzz")
        l += "FizzBuzz"
    elif i % 3 == 0:
        # L.appned("Fizz")
        l += "Fizz"
    elif i % 5 == 0:
        # L.append("Buzz")
        l += "Buzz"
    else:
        l += str(i)
# print(l)
print(l.count("z"))