# 123 Number Flip

You are given an integer `n`

consisting of digits `1`

, `2`

, and `3`

and you can flip one digit to a `3`

. Return the maximum number you can make.

**Constraints**

`1 ≤ n < 2 ** 31`

https://binarysearch.com/problems/123-Number-Flip

## Examples

### Example 1

**Input**

- n =
`123`

**Output**

- answer =
`323`

**Explanation**

We flip `1`

to `3`

### Example 2

**Input**

- n =
`333`

**Output**

- answer =
`333`

**Explanation**

Flipping doesn’t help.

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