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Score : $100$ points

### Problem Statement

In the Kingdom of AtCoder, there is a standardized test of competitive programming proficiency.

An examinee will get a score out of $100$ and obtain a rank according to the score, as follows:

• Novice, for a score not less than $0$ but less than $40$;
• Intermediate, for a score not less than $40$ but less than $70$;
• Advanced, for a score not less than $70$ but less than $90$;
• Expert, for a score not less than $90$.

Takahashi took this test and got $X$ points.

Find the minimum number of extra points needed to go up one rank higher. If, however, his rank was Expert, print expert, as there is no higher rank than that.

### Constraints

• $0 \leq X \leq 100$
• $X$ is an integer.

### Input

Input is given from Standard Input in the following format:

$X$


### Sample Input 1

56


### Sample Output 1

14


He got $56$ points and was certified as Intermediate. In order to reach the next rank of Advanced, he needs at least $14$ more points.

### Sample Input 2

32


### Sample Output 2

8


### Sample Input 3

0


### Sample Output 3

40


### Sample Input 4

100


### Sample Output 4

expert


He got full points and was certified as Expert. There is no rank higher than that, so print expert.