CF515C Drazil and Factorial

Drazil is playing a math game with Varda. Let's define  for positive integer $ x $ as a product of factorials of its digits. For example, . First, they choose a decimal number $ a $ consisting of $ n $ digits that contains at least one digit larger than $ 1 $ . This number may possibly start with leading zeroes. Then they should find maximum positive number $ x $ satisfying following two conditions: 1\. $ x $ doesn't contain neither digit $ 0 $ nor digit $ 1 $ . 2\.  = . Help friends find such number.

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In the first case,