--- a/.emacs-my	Thu Dec 10 21:58:03 2015 +0200
+++ b/.emacs-my	Fri Dec 11 18:54:46 2015 +0200
@@ -815,7 +815,9 @@
        ((eq arg 3)
         (activate-input-method my-ukranian-input-method))
        ((eq arg 4)
-        (activate-input-method my-ipa-input-method)) )
+        (activate-input-method my-ipa-input-method))
+       ((eq arg 5)
+        (activate-input-method 'TeX)) )
     (toggle-input-method arg)) )
 
 (global-set-key (kbd "C-\\") 'my-toggle-input-method)