class Country
  def initialize(string)
    @country_string = string
    @country_data= @country_string.split
    @country_code = @country_data[0]
    @country_gold = @country_data[1]
    @country_silver = @country_data[2]
    @country_bronze = @country_data[3]
    @country_pop = @country_data[4]
  end

  def to_s
    return @country_string
  end
  end

class MedalRankings
  def initialize
    @countries = Array.new
  end

  def add_country(country)
    unless country.nil? {@countries << country}; end
  end

  def to_s(n)
    for i in 0..n do
      unless n.nil? {@string << @countries[i].to_s}; end
    end
    return @string
  end

end

medal_rankings = MedalRankings.new
IO.foreach('medals.txt') do |line|
  medal_rankings.add_country(Country.new(line))
end
puts medal_rankings.to_s(5)