Rough iteration of a logo

Normally I do not upload rough things where I'm working on but today is an exception. I have 3 shapes, two orange ones and one red. Now, I only want to have the bottom points of the shape rounded but everything I tried does round the other two too. So I am looking for a way to have only the bottom ones rounded while the rest of the shape keeps untouched. Anyone who can come up with a solution?