1; Basic integer math. 2(+ 4 4) ; -> 8 3(- 4 4) ; -> 0 4(/ 4 4) ; -> 1 5(* 4 4) ; -> 16 6 7; Nested calls, varying arity. 8(+ (* 2 2 2) 9 (- 3) 10 (/ 4 2)) ; -> 7