Counting occurences of a string

Hey Guys,

I tried using counif statement, but that doesn look like it will work.

What I have is a column with multiple pieces of data and I would like to account for the occurences a certain string appears in the column

A
1) 11
13
13.1
12
------------------
2) 13

So my primary goal would be for the example above is to count all the occurences of just "13"(not 13.1) in column A

My secondary would be able to use a cell reference in all of this, ie find all occurences of B1

I look forward to suggestions