num = gets.to_i
@count = 0

def FizzBuzzString(num)
  (1..num).each do |n|
    if n % 15 == 0
      @count += 4
    elsif n % 3 == 0
      @count += 2
    elsif n % 5 == 0
      @count += 2
    end
  end
end

FizzBuzzString(num)
print @count