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.

Input

Input is given from Standard Input in the following format:
X

Output

Print the answer.

Constraints

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

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.

见题面 Input 部分

见题面 Output 部分