Count the number of times a record appears and place in a bucket, SSRS

More head banging for something that I'm sure is an easy solve. I'm attempting to count the number of accounts that appear in a dataset more than once, but less than 6 times. I have additional buckets, but if I can get this, I'll be good from here.  I just can't even get the code to count the number of instances that accounts appear more than 2x's.

123
123
456 
456
111 
111 
111

I should be able to say that the above dataset based on my query = 3 accounts appear more than 2 times but less than 6. I want to count 123 as 1 instance, 456 as 1 instance and 111 as 1 instance since they all appear greater than or equal to 2 times. After I figure this out, I should be able to get to the point where I can do my buckets. But, I can't seem to breakthrough this part yet.

I have tried this, and it works, but doesn't give the result I want. It gives me the number of records in the data set.

=IIF(count(Fields!AcctID.Value) >= 2, Count(Fields!Instance.Value),0)

I have also tried this, and it also gives me the same result as the code above:

=Count(IIF(Fields!AcctID.Value >= 2, Fields!Instance.Value,0))