Description

1   8    2    1    9

1   7    3    5    2

1   2   10   3    18

8  4     7   9      2

7  4     1   3      1

If we select 10 from 3rd row inthird column , entire 2nd row , 4th row become zero , and 3rd row column 2, 3rd row 4th column also become 0;

Matrix after this selection becomes :

1  8  2  1  9

0  0  0  0  0

1  0 10 0 18

0  0  0  0  0

7  4  1  3  1

Input
The input contains several test cases. The first line of a test case contains two positive integers
M and N (1 ≤ M × N ≤ 105), separated by a single space, indicating the number of rows and
columns respectively. Each of the following M lines contains N integers separated by single spaces, each representing the initial number of hostages in the cell. Each cell will
have initially at least 1 and at most 103 hostages.
The end of input is indicated by a line containing two zeroes separated by a single space.

Output
For each test case in the input, your program must print a single line, containing a single value,
the integer indicating the maximum number of hostages that can be freed.
The output must be written to standard output.
Sample input
5 5
1 8 2 1 9
1 7 3 5 2
1 2 10 3 10
8 4 7 9 1
7 1 3 1 6
4 4
10 1 1 10
1 1 1 1
1 1 1 1
10 1 1 10
2 4
9 10 2 7
5 1 1 5
0 0
Output
54
40
17