# frozen_string_literal: true
in_l, in_r = gets.chomp.split.map(&:to_i)

langs = Set[]
in_l.upto(in_r) do |i|
  case i
  when 1..295
    langs << "C++"
  when 296..416
    langs << "Rust"
  when 417..420
    langs << "Python"
  end
end

puts langs.size - 1