Tightrope Walker

A boy is walking a tightrope . While walking, he either bends left or right to balance himself. If the boy bends by more than a certain angle, he falls down. The boy bends by a fixed angle everytime he decides to bend. (Same magnitude of the angle on the left side as well as right) Given the series of bends performed by the boy, find out whether he completes walking the tightrope entirely or not.