def bouncingBall(h, bounce, window):
    BounceFactor = bounce
    BallDropHeight = h
    ViewerHeight = window
    BounceLeft = h
    BallSeenTimes = 1
    if bounce > 1 or bounce < 0 or window >= h or h ==0:

        return -1
    else:
        while (BounceLeft > ViewerHeight):
            BounceLeft = BounceLeft * BounceFactor
            if (BounceLeft > ViewerHeight):
                BallSeenTimes = BallSeenTimes + 2
            else:
                break
        return BallSeenTimes