content: here they went in , and the cat stood with a cake of rye meal just below the door . suddenly there came a thundering and a thumping so that the earth trembled , and the whole castle shook , and that was the troll who was coming home . and suddenly all was quiet again , and before they knew it , helge - hal in the blue hill had thrust his three great horrible heads in at the door .
answer: three .
question: how many heads did helge-hal in the blue hill have ?
target: how many heads did helge-hal in the blue hill have ?
references: how many heads did helge-hal in the blue hill have ?