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

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

$X$