Looping should not be necessary. You can use an AreaOnAreaOverlayer, writing the Value attribute to a list, a ListSorter to ensure list element 0 contains the lowest (or highest) value, a ListIndexer to write the value of element 0 back to the Value attribute, and a Dissolver to merge the polygons on the Value attribute.

Something like the solution to this question.

I am new if you dont mind can you help me out to create the workspace form e

The best way to learn FME is to try it for yourself.

The workspace in the question I linked to should give you something to start with.

Thanks for your helpp