Count number of rows in multiple arrays with identical values

Hi,
I have an excel sheet with a set number of IDs. For each ID, I am receiving data from three sources. The data from each source is stored in separate columns. For each ID number, I can receive data from either 1, 2, 3, or no data sources.

I need to be able to count the number of times the data for a particular ID number, from any sources, is identical. For example, for ID 3 I could receive data with the value 5 from all data sources. For ID 10 I could receive data with the value of 9 from source 1 and the 7 from source 2. In that case, I would count ID 1, but not ID 2.

I have attached a spreadsheet with a simplified example of the datastructure I have. I have a suspicion I should be able to do this with a SUMPRODUCT or an array function, but am not sure how to do this.

Any help appreciated

Steven