#!/usr/local/bin/lua52
-- Ackermann Funktion in Lua 
--[[A multi-line 
    comment --]]
function ack(M,N)
    if M == 0 then return N + 1 end
    if N == 0 then return ack(M-1,1) end
    return ack(M-1,ack(M, N-1))
end

print ("Ack(3,8) = ",ack(3,8) )
print ("Ack(4,0) = ",ack(4,0) )