Given an N × M matrix find the maximum average of a row in it.

Input

First line containing two integers N and M (1 ≤ N, M ≤ 10).

The following N lines each contains M integers representing the matrix.

The absolute value of values in the matrix won't exceed 100.

Output

The maximum average of a row with 2 decimal places.

Example

Input:
2 2
1 0
1 1

Output:
1.00

Explanation

The average of the first row is (1 + 0) / 2 = 0.5

The average of the second row is (1 + 1) / 2 = 1