APT: Simple Average AimToTen

Class

public class AimToTen { public int need(int[] marks) { // fill in code here } }

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.

Constraints

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

Examples

```
{9, 10, 10, 9}

Returns: 0
```
Your average is already 9.5, so no future assignments are needed.
```
{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.


{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

```
    	

{10, 10, 10, 10}

Returns: 0
```

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