sncc is correct. I only had 22 as a Sr. Member because I was not active for the whole of last year. theymos hasn't made the data public so nobody knows exactly how many sMerit anyone else received.
I see, the Sr. Member I mentioned registered here on March last year. He posted 583 posts last year and must have earned most of the Activity, so I assume 26 is more or less close to the upper bound for Sr. Member.
Instead, the total number of initial sMerit is disclosed as about 600k by the theymos' reply below: