input string "Enter a number:"
set "in" to "('ABS('input')')"
if "in" <= 1 then "one"
set "result" to 1

: "factorial"
set "result" to "('result' * 'in')"
dec "in" by 1
if "in" > 1 then "factorial"
* "('result')"
end

: "one"
* "1"
end