What’s the maximum number of affiliate links per post?

Hello!
I decided to use amazon affiliate network for get extra earnings. So i added two Amazon wireless banners to my blog sidebar. Also i added 3 affiliate links to my one post (I have only one post with affiliate links). So what’s the optimum number of affiliate links should i use in one blog. I think if i added exclusive affiliate links Google will punish me.
Thanks!

See original post by TSG