His two most financially successful films were released in NUMBER@1 : Blazing Saddles -LRB- co-written with PERSON@1 , PERSON@2 , PERSON@3 and PERSON@4 -RRB- , and PERSON@5 -LRB- co-written with PERSON@6 -RRB- .

Two of his most popular films are Young Frankenstein -LRB- co-written with PERSON@6 -RRB- and Blazing Saddles -LRB- co-written with PERSON@1 -RRB- .
