Task: Question Answering
Input (English): Sentence: On January 7, 2012, Beyoncé gave birth to her first child, a daughter, Blue Ivy Carter, at Lenox Hill Hospital in New York. Five months later, she performed for four nights at Revel Atlantic City's Ovation Hall to celebrate the resort's opening, her first performances since giving birth to Blue Ivy. 
Question: How many nights did she perform at Atlantic City?
Output (English): four nights