Countif with data validation

Hello all, Happy new year.

This one has proved to be quite the challenge for me:

Opening the workbook attached, you will see 3 sheets, Grid model, Dates for month and Interruptions.


The grid model contains all the values to be counted on a daily basis, the Dates for month is the data validation sheet for ('Interruptions' cell F1) which allows results on the interruption sheet change when a different date is picked form the drop down list.

I want to replicate cell F1 in Cell O1 with a different count criteria such that whenever an instance occurs (EF, OC, IMB, EMG, etc...) it's counted as 1 value. The values in Cells O4 - V4 and below are all correct for the 1ST of December, however these are manually counted results and I would like a formula that could do this instantly and not just for 1 day but for the entire month.