test58.ans

user 0, cookie 0
user 1, cookie 1
user 2, cookie 4
user 3, cookie 9
user 4, cookie 16
user 5, cookie 25
user 6, cookie 36
user 7, cookie 49
user 8, cookie 64
user 9, cookie 81
10 users. Deleting odd id's...
user 0, cookie 0
user 2, cookie 4
user 4, cookie 16
user 6, cookie 36
user 8, cookie 64
5 users. Deleting remaining id's...
0 users.