Lucky Number-2
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A Lucky number is the largest number made up of only digits 2,3 and 5 such that the count for each digit is divisible by the number obtained by multiplication of remaining two digits. You are provided with the number N and you have to output the lucky number of N digits. If no lucky number exists for the given N output -1.

Example 1:

N = 4
There isn't any 4 digit Lucky Number.

Example 2:

N = 16
There are six '5' and ten '3' in the
number. And also, 2*3=6 and 2*5=10.
There is no 16 digit number greater
which satisfies the conditions.

Your Task:
You don't need to read input or print anything. Your task is to complete the function getLuckyNum() which takes an Integer N as input and returns the answer as a String.

Expected Time Complexity: O(N3)
Expected Auxiliary Space: O(1)

1 <= N <= 103

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