class Calc0152
  def initialize(args)
    args = args.map { |l| l.chomp.split(/\s+/) }
    @l = args.shift.first.to_i
  end

  def run
    (2..(Math.sqrt(@l / 4).floor)).flat_map { |m|
      (1...m).select { |n|
        (m - n).odd? && m.gcd(n) == 1 && 8 * m * (m + n) <= @l
      }
    }.size
  end
end

puts Calc0152.new(STDIN.readlines).run if __FILE__ == $0