Among the customers from Brazil, how many customers are in automobile market segment?
customers refer to c_custkey; Brazil is the name of the nation which refers to n_name = 'BRAZIL'; c_mktsegment = 'automobile';
SELECT COUNT(T1.c_custkey) FROM customer AS T1 INNER JOIN nation AS T2 ON T1.c_nationkey = T2.n_nationkey WHERE T1.c_mktsegment = 'AUTOMOBILE' AND T2.n_name = 'BRAZIL'