N=gets.chomp.to_i

def fizzbuzz(n)
  str = ""
  if n % 3 == 0 and n % 5 == 0
    str = "FizzBuzz"
  elsif n % 3 == 0
    str = "Fizz"
  elsif n % 5 == 0
    str = "Buzz"
  else
    str = n.to_s
  end
  return str
end

str = ""
for num in 1..N
  str += fizzbuzz(num)
end

c = 0
for num in 0..(str.length - 1 )
  if str[num] == "z"
    c += 1
  end
end

puts c