node counter(res: bool; tick: bool) returns (o: int)
let
  o = if res then 0 else if tick then 1 -> pre o + 1 else 0 -> pre o;
tel

node main() returns (y:int)
var half:bool;
let
  y = counter(false fby (y > 35), half);
  half = true fby not half
tel