(1..200).each do |a|
  (1..10).each do |b|
    File.open("images/#{a}_#{b}.png", "wb") do |f|
      open("http://megaresheba.ru/006/11/b02-exam-2014-1/#{a}/#{b}.png", "rb") do |read_file|
        f.write(read_file.read)
      end
    end
  end
end