AtCoder Quiz 2

Source: AtCoder

Problem Statement

A test score ranges from $0$ to $100$, with next-rank thresholds at $40$, $70$, and $90$. At $90$ or above there is no higher rank. Given $X$, find the minimum extra points needed for the next rank.

Input

One line contains $X$.

Output

If $X<90$, print the points needed to reach the next threshold; otherwise print expert.

Subtasks

• Subtask 1 (100%): $0 \le X \le 100$

Examples

Example 1

Input

56

Output

14

Explanation

For the sample values 56, evaluating the conditions in the statement gives 14. Therefore the program prints the shown output.

Example 2

Input

32

Output

8

Explanation

For the sample values 32, evaluating the conditions in the statement gives 8. Therefore the program prints the shown output.

Example 3

Input

0

Output

40

Explanation

For the sample values 0, evaluating the conditions in the statement gives 40. Therefore the program prints the shown output.

Example 4

Input

100

Output

expert

Explanation

For the sample values 100, evaluating the conditions in the statement gives expert. Therefore the program prints the shown output.