Task: Question Understanding
Input (English): Passage: Nintendogs also had very successful launches in North America and Europe, with first week sales of over 250,000 and 160,000 respectively. Lab & Friends received a "Double Platinum" sales award from the Entertainment and Leisure Software Publishers Association (ELSPA), indicating sales of at least 600,000 copies in the United Kingdom. ELSPA also gave Dalmatian & Friends a "Platinum" award, for at least 300,000 sales in the United Kingdom.  By August 2006, in the United States, Chihuahua & Friends had sold 570,000 copies and earned $17 million; Labrador & Friends had sold 620,000 copies and earned $19 million; and Dachshund & Friends had sold 730,000 copies and earned $22 million. During the period between January 2000 and August 2006, the games were respectively the 50th, 44th and 32nd highest-selling games launched for the Game Boy Advance, Nintendo DS or PlayStation Portable in the United States.
Question: How many more games sold for Labrador & Friends than Chihuahua & Friends?
Output (English): number