Max has recently discovered a new typing test website called LeetCode.

On this website, he is prompted to type as many words as possible in a given text.

He knows that he can type words in seconds, but he still would have seconds left and wants to achieve a WPM (words per minute) of .

Since Max is too busy typing, he cannot solve this problem, so he ~~blackmails~~ kindly requests you to help him.

Can you determine how many more words he must type to achieve WPM?

#### Constraints

#### Input Specification

The first line will contain an integer, , the number of words he can type in that time.

The second line will contain an integer, , the number of seconds it takes him to type words.

The third line will contain an integer, , the WPM he wants to achieve.

#### Output Specification

Output how many more words he must type to achieve WPM.

#### Sample Input

```
120
45
165
```

#### Sample Output

`45`

## Comments