Description

$n(n\le 100)$ students take part in a singing contest and receive scores from $m(m\le 20)$ judges. The score range is from $0$ to $10$. A student’s final score is obtained by removing the highest score and the lowest score among the judges’ scores, then taking the average of the remaining $m-2$ scores. What is the highest final score among all students? Keep the score to $2$ decimal places.

Input Format

The first line contains two integers $n,m$.
The next $n$ lines each contain $m$ integers, representing the scores.

Output Format

Output the highest final score among the students, rounded to two decimal places.

7 6
4 7 2 6 10 7
0 5 0 10 3 10
2 6 8 4 3 6
6 3 6 7 5 8
5 9 3 3 8 1
5 9 9 3 2 0
5 8 0 4 1 10

6.00

Hint

Translated by ChatGPT 5