Computer Programming Contest Preparation

    1 2
    2 6
    3 2
    4 2
    5 2
    6 4
    7 4
    8 1
    9 6
   10 6
   11 6
   12 4
   13 2
   14 6
   15 8
   16 4
   17 8
   18 8
   19 4
   20 8
   21 6
   22 4