def fizzbuzz(n)
  if n % 15 == 0
    "FizzBuzz"
  elsif n % 3 == 0
    "Fizz"
  elsif n % 3 == 0
    "Buzz"
  else
    n.to_s
  end
end

N = gets.to_i
puts N.times.map { fizzbuzz(_1) }.join.count("z")