SUM of TOP N by two categories

[arquironsalud]

Hi, I have a table like these:

Nacionality	Name	Nº childs
Italian	Antonella	12
Spanish	Hugo	15
German	Franz	13
Russian	Sacha	11
Italian	Bianca	17
Spanish	Lucas	32
German	Kurt	21
Russian	Vladimir	27
Italian	Chiara	49
Spanish	Martin	3
German	Günter	9
Russian	Dimitri	14
Italian	Fiorella	31
Spanish	Daniel	37
German	Hans	22
Russian	Igor	23

I want to know the total sum of children with names that are in the Top 3 names of each nationality.
I explain this in more detail with the data in the table above:

Top 3 Italian names = Chiara (49), Fiorella (31) and Bianca (17)
Total number of children with Italian top 3 names = 97 (coming from 49+31+17)

Top 3 Spanish names = Daniel (37), Lucas (32) y Hugo (15)
Total children with Spanish top3 names = 84 (coming from 37+32+15)

Top 3 German names = Hans (22), Kurt (21) and Franz (13)
Total children with German top3 names = 56 (coming from 22+21+13)

Top 3 Russian names = Vladimir (27), Igor (23) and Dimitri (14)
Total children with Russian top3 names = 64 (coming from 27+23+14)

What I want to calculate with DAX is the total sum of children with names belonging to the Top 3 by nationality

Total children with names in Top3 of their nationality = 301 (comes from 97+84+56+64)

That 301 children is the measure that I need to obtain with the table that I indicated at the beginning

I hope you can help me. Thank you very much in advance.

[johnt75 · Accepted solution]

Num with top names =
VAR SummaryTable = 
GENERATE(
	VALUES('Table'[Nacionality]),
	CALCULATETABLE(
		SELECTCOLUMNS(
			TOPN(3, 'Table', 'Table'[Nº childs]),
			"Name", 'Table'[Name],
			"Children", 'Table'[Nº childs]
		)
	)
)
return SUMX(SummaryTable, [Children])