#### You & Spiral

**Author: ** Abu Rayhan Ahmad

Problem Setter:. Hasan Ali, 24th Intake, Dept. of CSEBangladesh University of Business and Technology (BUBT)

It’s a game. Have two players you and your enemy. You have a
matrix of ** r*c (row and column)**. In each step both you and your enemy must
be collect all point from entire row/column which are not collected by opponent.
The collection must start from row and then consecutively column and row. First
your enemy starts and he/she start from bottom right corner. Let’s simulate
first.

First Step:

Second Step:

Third Step:

Forth Step:

And all collected. And enemies point is 36.

**Now, your task is to find out your
enemies total point.**

#### Input Format

First line of input consist two number
r(0<r<=1000) and c(0<n<=1000) denoting the number of row and column of the
matrix (for the example above row is 5 and column is 4). Next there will given
a r*c matrix all values are between -10000 to 10000.

#### Output Format

Your task is to find the output.

#### Samples

###### Input

###### Output

Language | Time | Memory |

GNU C 11 | 1s | 512MB |

GNU C++ 14 | 1s | 512MB |

GNU C++ 11 | 1s | 512MB |