There are 3 main components, awarded with specific jerseys. The yellow jersey is worn by the overall time leader and is the most important one. It is awarded by calculating the total time each rider has been riding by adding the times taken to complete each stage so far. The rider with the lowest total time is considered the leader, and at the end of the event is declared the overall winner of the Tour. The colour was originally a reference to the newspaper which sponsored the race, which had yellow pages. The green jersey is awarded for sprint points. At the end of each stage, points for this jersey are gained by the riders who finish first, second, etc. The number of points and the number of cyclists rewarded depends on the type of stage - many for a flat stage, slightly fewer for an intermediate stage and fewer still for a mountainous stage. There are also a few points for the riders who are first at some intermediate points, usually about 2 to 3 per stage. At those intermediate points (as well as at the finish) there are also bonus seconds for the yellow jersey, but those are so few that they rarely if ever have an influence on the final standings. They do however play a role in the first week, before the mountain stages, as the overall standings are usually less well separated. The "King of the Mountains" wears a white jersey with red dots, sometimes referred to as the "polka dot jersey". At the top of each climb in the Tour, there are points for the riders who are first over the top. The climbs are divided into categories from 1 (most difficult) to 4 (least difficult) based on their difficulty, measured as a function of their steepness and length. A fifth category, called Hors categorie (outside category) is formed by mountains even more difficult than those of the first category. In 2004, the scoring system was changed such that the first rider over a fourth category climb was awarded 3 points while the first to complete a hors category climb would win 20 points. Further points over a fourth category climb are only for the top three places while on a hors category climb the top ten riders are rewarded. Additionally beginning in 2004, points scored on the final climb of the day were doubled if said climb was at least a second category climb. The colours of the jersey were decided by the original sponsor, Poulain Chocolate, to match a popular product. Two lesser classifications are that for the white jersey, which is like the yellow jersey, but only open for young riders (those who are less than 25 years old on January 1 of the year the Tour is ridden), and that for the red number, which goes to the most combative rider. Each day, a group of judges awards points to riders who made particularly attacking moves that day. The rider with most points in total gets a white-on-red (instead of a black-on-white) identification number. Since 2004 the number is not white-on-red anymore but white-on-blue. Finally, there is a team classification. For this classification, the time of the first three riders from each team is added after each stage. The Tour currently has 21 teams of 9 riders each (when starting), each sponsored by one or more companies - although at some stages of its history, the teams have been divided instead by nationality. The team classification is not associated with a particular jersey design.