### Problem Statement

You are given a int[] marks containing the grades you have received so far in a class. Each grade is between 0 and 10, inclusive. Assuming that you will receive a 10 on all future assignments, determine the minimum number of future assignments that are needed for you to receive a final grade of 10. You will receive a final grade of 10 if your average grade is 9.5 or higher.

### Definition

 Class: AimToTen Method: need Parameters: int[] Returns: int Method signature: int need(int[] marks) (be sure your method is public)

### Constraints

-marks has between 1 and 50 elements, inclusive.
-Each element of marks is between 0 and 10, inclusive.

### Examples

0)

 `{9, 10, 10, 9}`
`Returns: 0`
1)

 `{8, 9}`
`Returns: 4`
 In this case you need 4 more assignments. With each completed assignment, your average could increase to 9, 9.25, 9.4 and 9.5, respectively.
2)

 ```{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}```
`Returns: 950`
3)

 `{10, 10, 10, 10}`
`Returns: 0`

#### Problem url:

http://www.topcoder.com/stat?c=problem_statement&pm=5879

#### Problem stats url:

http://www.topcoder.com/tc?module=ProblemDetail&rd=8070&pm=5879

supernova

#### Testers:

PabloGilberto , brett1479 , Olexiy

#### Problem categories:

Simple Search, Iteration