N = int(input())
string = ""
for i in range(1, N + 1):
    if i % 3 == 0:
        if i % 5 == 0:
            string += "FizzBuzz"
        else:
            string += "Fizz"
    elif i % 5 == 0:
        string += "Buzz"
    else:
        string += str(i)
print(string.count("z"))