na nana nana san francisco

help, please, i heard this song in a pub, i got it in mind since sunday, please help.
The only thing i guess is it should be from the 70's (almost rock i guess) and the chorus has the name of San Francisco...

scott mckenzi "san francisco"?????- not sure if that's the right title of the song though

Hmm... is it that old song that goes
"If you're going to San Francisco,
be sure to wear some flowers in your hair" ?

It's from the 70's for sure.