This was something I've made with redstone.
piston extenders!!!
i have the easy 1(just redstone into a piston with a block on it)
and then 2 pistons that both retract back to the start
and then 3, 4 and you guessed it...
5.

I'm sorry if the redstone is hard to follow but it should all work, let me know if it doesn't though.

If you use Dropbox instead of media fire then here is the Dropbox link:
https://www.dropbox.com/s/9h7ygrbrnu32p82/Piston_Extender.zip?dl=0