Three leading AI-powered creative assistants—Gemini, ChatGPT, and Claude—enter the first ever ASCII Art Contest, where they must impress a panel of human judges with their text-based masterpieces.

Each participant receives a score between 80 and 100 (inclusive). The organizers want to announce the final standing only if the judges' opinions are "close enough"; otherwise, they will ask the judges to reconsider.

Given the three integer scores of Gemini, ChatGPT, and Claude, determine the contest result:

• If the maximum score and the minimum score differ by at least 10 points, print check again (the judging seems inconsistent, so the panel must re-evaluate).
• Otherwise, print final X, where X is the median of the three scores (the score that would be in the middle if all three were sorted in non-decreasing order).

Input

A single line contains three integers $g, c, \ell$, representing the scores of Gemini, ChatGPT, and Claude respectively.

• $80\le g, c, \ell \le 100$

Output

Print the required answer in a line.

Samples

88 94 95

final 94

100 80 81

check again

98 99 98

final 98

95 86 85

check again