Oh, sorry, it seams that the sheet was created using my default language preferences. I suppose this can be easyly changed, but I need to see how.
As you say, there is a "CONTAR.SI" equivalent to "COUNTIF". I hate this of translating commands of language programs/Excel. It's a source of problems and the effort to learn one word or other is mainly the same, having you to learn again if you work in other language. Inherited bad ideas...