(function "tak" (x:int y:int z:int)
  (if (> x y)
      (app "tak" [(app "tak" [(- x 1) y z] int)
                  (app "tak" [(- y 1) z x] int)
                  (app "tak" [(- z 1) x y] int)] int)
      z))

(function "takmain" (dummy: int)
   (app "tak" [18 12 6] int))