There were 60 students registered in this course on the first day of the Winter session. 16 of the students are in Psychology and 29 are MOS, with the rest being from "Other" departments. 25 of the 60 students are domestic and 12 of the domestic students are in MOS, while 8 of the international students are in Psychology. Only 19 of the 60 did not enter the course website by the first day, and these 19 included exactly 5 Psychology students and exactly 4 students from "Other" departments and also included exactly 9 domestic students. Only 3 international Psychology students did not enter the website by the first day, while exactly 4 domestic students from "Other" departments did. Complete a tree diagram and find how many of the international MOS students in the course entered the website by the first day?