PROBLEM STATEMENT
You enjoy working with numbers that contain only square digits (namely, 0, 1, 4 and 9).  The 
sequence containing only these digits is 0, 1, 4, 9, 10, 11, 14...   Return the n-th term (indexed 
from 0) in this sequence.

DEFINITION
Class:SquareDigitNumbers
Method:getNumber
Parameters:int
Returns:int
Method signature:int getNumber(int n)


CONSTRAINTS
-n will be between 0 and 1000, inclusive.


EXAMPLES

0)
0

Returns: 0

The first square digit number is 0.

1)
5

Returns: 11



2)
16

Returns: 100



3)
121

Returns: 1941



4)
123

Returns: 1949



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