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Contest: Task: Related: TaskB

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:

$X$

Output

Print the answer.

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.