[Help] Count in DAX!

I have four tables. Table Agreement, Beaches, Connection and District.

Table Connection has a column AgreementID and BeachID.

Here is the relationship between the table:

Table Agreement &Table Connection through Agreement ID

Table Beaches & Table Connection through Beach ID

Table District & Table Beaches through District ID

Now, what I want to count is the number of Agreement ID per District. Sample data:

Result should be like this:

Should I create a measure column or merge queries?

Thank you!!!