Yes, there's as many ways to understand the term "effortlessly" as respondents.
Understanding the question as "how many programming languages I had used in the past to produce nontrivial programs and would likely be able to do this again with little to no refreshing my knowledge", my answer is 8: Pascal, OCaml, C, Java, Haskell, Common Lisp, JS, Clojure (listed roughly in chronological order of learning).
Understanding the question as "how many programming languages I had used in the past to produce nontrivial programs and would likely be able to do this again with little to no refreshing my knowledge", my answer is 8: Pascal, OCaml, C, Java, Haskell, Common Lisp, JS, Clojure (listed roughly in chronological order of learning).