Howto aggregate series doing a select on infludb database?


I have to export/import a large database with a lot of series and i would like to know how many “values” are in the database ?
I do that : select count(value) from /^*$/;
but i list alla series with its count.
Is it possible to have just one number ?
Thanks for advance
Best regards.
PS: I apologize if this question already exists. I don’t find anything in my search.