Need a countif function that takes two conditions into account PLEASE HELP URGENT

Hello
I will start by saying I am awful with excel but learn fast and I'm a psychology student, this is data from an experimental game.

In column I is every single click made on a console, either "1" (for left) or a "3" (for a right). There are thousands and thousands of 1's and 3's in column I.

In Column K is the clicker id e.g. "10_263C34".

Each clicker id represents a person.

I want to find out how many 1's and how many 3's each person (i.e. each clicker id in column K) clicked.

Therefore I need something like "countif(I2:I432394243, "1" AND (corresponding row in K="10_263C34")"

"countif(I2:I432394243, "3" AND (corresponding row in K="10_263C34")"

There may also be a completely different formula to do this
Or it may be impossible
Thank you in advance
Imogen

Thank you so much Tony Valko, that worked!!!!! Do you know how I can collapse the list of clicker id's into one where all the clicker ids are only said once rather than 100s of times?