CREATE TABLE table_name_2 (races INT, series VARCHAR, team VARCHAR)

How many races did the Formula Three Euroseries signature team have?
SELECT SUM(races) FROM table_name_2 WHERE series = "formula three euroseries" AND team = "signature"
SELECT SUM("races") FROM "table_name_2" WHERE "formula three euroseries" = "series" AND "signature" = "team"