What is the sum of team impul with the date of 8 july
CREATE TABLE "race_calendar_and_results" (
  "round" real,
  "track" text,
  "date" text,
  "pole_position" text,
  "fastest_race_lap" text,
  "winner" text,
  "team" text
);
SELECT SUM("round") FROM "race_calendar_and_results" WHERE "team"='team impul' AND "date"='8 july';