How to reduce polycount with 3ds Max 2011?

[Serindas]

http://imagizer.imageshack.us/v2/150x100q90/c/690/6xax.jpg

 

I've found this helmet on DeviantArt, but it's made by 255.000 polygons, so, before add it to the game, i need to reduce the polycount. Anyone know a good beginners tutorial for 3ds Max 2011?

Edited December 1, 2013 by Serindas