I did not attend the exam, however one of my three allowed attempts has been wasted, why?
According to the Rules of current students' performance assessment, the attempt for the exam is considered wasted if student misses the exam date. 

Students who have valid reasons for missing the date for the exam, should present the evidence of this reason no later than three days from the exam (day of the exam included). It can be done in Sechenov MFC or in "Applications" section in the personal account. In case of student having a confirmed valid reason, missing the date of the exam will not waste an attempt.