Timer - Help?

local m = math.random == -1

local countdownMessage = game.StarterGui.Timer.TextLabel
countdownMessage.new("The next round will be in" m,"seconds.)
    wait(180)
    countdownMessage.new("The round has ended.)
end

What in the world is the problem? All it does is first show 3:00, then it subtracts 1, and goes to 2:59 and so on. What's the problem?