### Problem Statement

In a restaurant, if you were pleased by the waiter's service, you may leave him a tip -- you pay him more than the actual value of the bill, and the waiter keeps the excess money. In some countries, not leaving a tip for the waiter is even considered impolite. During my recent holiday I was having dinner in a foreign restaurant. The pamphlet from my travel agency informed me that the proper way of tipping the waiter is the following:
• The sum I pay must be round, i.e., divisible by 5.
• The tip must be between 5% and 10% of the final sum I pay, inclusive.
Clearly, sometimes there may be multiple "correct" ways of settling the bill. I'd like to know exactly how many choices I have in a given situation. I could program it easily, but I was having a holiday... and so it's you who has to solve this task. You will be given:
• an int bill -- the amount I have to pay for the dinner
• an int cash -- the amount of money I have in my pocket
Write a function that computes how many different final sums satisfy the conditions above.

### Definition

 Class: TippingWaiters Method: possiblePayments Parameters: int, int Returns: int Method signature: int possiblePayments(int bill, int cash) (be sure your method is public)

### Notes

-Assume that both bill and cash are in dollars.
-All the money I have is in one-dollar banknotes.

### Constraints

-bill and cash are between 1 and 2,000,000,000, inclusive.
-bill doesn't exceed cash.

### Examples

0)

 `4` `100`
`Returns: 0`
 4 isn't a round sum, and 5 is too much.
1)

 `23` `100`
`Returns: 1`
 The only correct choice is to pay 25 dollars, thus leaving a tip of 2 dollars.
2)

 `23` `24`
`Returns: 0`
 The same bill, but I don't have enough money to leave an appropriate tip.
3)

 `220` `239`
`Returns: 1`
 This time, it is appropriate to pay either 235 or 240 dollars. Sadly, I don't have enough money for the second possibility.
4)

 `1234567` `12345678`
`Returns: 14440`
 A large bill, but with that much money I don't care.
5)

 `1880000000` `1980000000`
`Returns: 210527`
6)

 `171000000` `179999999`
`Returns: 0`

#### Problem url:

http://www.topcoder.com/stat?c=problem_statement&pm=4745

#### Problem stats url:

http://www.topcoder.com/tc?module=ProblemDetail&rd=8067&pm=4745

misof

#### Testers:

PabloGilberto , brett1479 , Olexiy

#### Problem categories:

Brute Force, Simple Math