Given a string `text`, you want to use the characters of `text` to form as many instances of the word "balloon" as possible.

You can use each character in `text` at most once. Return the maximum number of instances that can be formed.

Example 1:

    Input: text = "nlaebolko"
    Output: 1

Example 2:

    Input: text = "loonbalxballpoon"
    Output: 2

Example 3:

    Input: text = "leetcode"
    Output: 0

Constraints:

- `1 <= text.length <= 104`
- `text` consists of lower case English letters only.