Task: Question Answering
Input (English): Passage: Mario -- Nintendo did not initially reveal Mario's full name. In a 1989 interview it was stated not to be ``Mario Mario'' despite the implication of the Mario Bros. series' title. The first notable use of ``Mario Mario'' was in the 1993 live-action film adaptation. This was again used in two of Prima's official strategy guides, in 2000 for Mario Party 2 and in 2003 for Mario and Luigi: Superstar Saga. In 2012 after Charles Martinet voiced Mario declaring himself ``Mario Mario'' at the San Diego Comic-Con the next month Satoru Iwata said he had no last name, which Shigeru Miyamoto agreed with the month after. Two months after Iwata's death in July 2015, Miyamoto changed his stance September 2015 at the Super Mario Bros. 30th Anniversary festival, confirming that his name was indeed Mario Mario.
Question: do the mario brothers have a last name
Output (English): 1