Here is my query. I want to get the sum from reqery result.

```
SELECT COUNT( user_id ) c
FROM mst_tabs
WHERE merchant_id =3
GROUP BY user_id
HAVING c >1 

```

This is my query result.I am trying to get the summation of this result.

```
    c 
--------    
    19
    3
    26
    93
    20
    2
    34
    5

```

I don't know how to use sum() with this result.