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).
Comments
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).