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**Task** | Statistics

Time limit: | 1.00 s | Memory limit: | 512 MB |

You are given a map of a forest where some squares are empty and some squares have trees.

What is the maximum area of a rectangular building that can be placed in the forest so that no trees must be cut down?

The first input line contains integers $n$ and $m$: the size of the forest.

After this, the forest is described. Each square is empty (

`.`

) or has trees (`*`

).Print the maximum area of a rectangular building.

- $1 \le n,m \le 1000$

Input:

`4 7`

...*.*.

.*.....

.......

......*

Output:

`12`