Question: The KVLY-TV mast is the fourth tallest structure in the world behind the megatall skyscraper that is how many stories in height?
Sentence (from "KVLY-TV mast"): The KVLY-TV mast (formerly the KTHI-TV mast) is a 2,063 ft (628.8 m) tall television-transmitting mast in Blanchard, Traill County, North Dakota, United States, used by Fargo station KVLY-TV channel 11.
Relevant evidence: No