Given an N by M matrix get the maximum average of a row in it.

Input

First line containing two numbers N and M (1 <= N,M <= 10).

The following N lines each contains M numbers 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 points.

Example

Input:
2 2
1 0
1 1
Output:
1.00


Explanation of sample input:
The average of the first row is (1 + 0) / 2 = 0.5
The average of the second row is (1 + 1) / 2 = 1