And let's not even talk about Indiana Jones 4 (what, there are only 3 Indiana Jones movies? Ok, I feel you).
Two. You meant 2 Indiana Jones movies, right? I'm sure you meant 2, because I really only remember seeing 2 (worthwhile) Indiana Jones movies.
Seriously though, it's sad when a poor sequel like Kingdom of the Crystal Skull makes a mediocre prequel like Temple of Doom look good.