You will be given a definition of a task first, then some input of the task.
In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Context: In 1990, Sega president Hayao Nakayama sought a flagship series to compete with Nintendo's Mario franchise Link Information: Nakayama and Rosen arranged for a group of investors to purchase Sega Enterprises in 1984 for $38million. Nakayama became CEO of Sega Enterprises, Question: How long has Nakayama been president of Sega when he was looking for a flagship series to compete with Mario?
Output:
Answer: 6