proc main() =
   echo 29
   # 1 -> 1,10
   # 2 -> 2,11,20 
   # 3 -> 3,12,21,30
   # 4 -> 4,13,22
   # 5 -> 5,14,23
   # 6 -> 6,15,24
   # 7 -> 7,16,25
   # 8 -> 8,17,26
   # 9 -> 9,18,27
   # 10 -> 28 
   # 11 -> 29
   # 12 -> xx

when isMainModule: main()