General Discussionmmr medal

so i started to play back dota 2 after i quit it after they change the mmr system to medal ( but yet, still use numbers ) so i play party mmr with my friend. after i play 3 calibration games, they show me my rank, is it shown archon 4 . and i never play any rank game before. the first time was with my friend . which is the 3 games i play. can someon explain me? but this is just party though