function ackermann m,n
    switch
        Case m = 0
            return n + 1
        Case (m > 0 And n = 0)
            return ackermann((m - 1), 1)
        Case (m > 0 And n > 0)
            return ackermann((m - 1), ackermann(m, (n - 1)))
    end switch
end ackermann