can't find my own nonce_salt

Hi!
I recently (yestarday) upgrade from WPMU 2.9.2 to wordpress multisite 3.1.2.
I had to fix some problems, but now seems works propely.

since I had some problems the upgrade procedure skipped the part where it shows witch is my nonce_salt to past in wp-config.

how can I find my own nonce_salt?