Add id to url after login user

I use FormView do login user, but I don't know how I should add his ID number to success url that when he will log in adres will be users/profile/id

urls.py

from users.views import RegisterView, LoginView, ProfileView

urlpatterns = [

        url(r'^register/$', RegisterView.as_view(), name='register-view'),
        url(r'^login/$', LoginView.as_view(), name='login-view'),
        url(r'^profile/(?P<pk>\d+)/$', ProfileView.as_view(), name='profile-view'),

views.py

class LoginView(FormView):
    template_name = 'login_form.html'
    model = MysiteUser
    form_class = AuthenticationForm
    success_url = '/users/profile/'    

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