I'm not sure if this works but you can try :)

// Routes

Session::put("wrongLogin", "0");

Route::get("/", function()
{

	return View::make("login")->with("wrongLogin", Session::get("wrongLogin"));

});


Route::post("/", function()
{

	$username = Input::get("username");
	$password = Input::get("password");

	$login = array("username" => $username, "password" => $password);

	if(Auth::attempt($login))
	{

		// show user link (logout, edit profile etc)

	} else {

		Sessions::put("wrongLogin",  (Session::get("wrongLogin") + 1));

		return View::make("login")->with("wrongLogin", Session::get("wrongLogin"));

	}
});



// View

@if($wrongLogin == 3)

Login is blocked

@else

Login form

@endif